diff --git a/composer.json b/composer.json
index 2ca78742e..57c26d342 100644
--- a/composer.json
+++ b/composer.json
@@ -10,7 +10,7 @@
         { "name": "Derick Rethans", "email": "github@derickrethans.nl" }
     ],
     "require": {
-        "ext-mongodb": "*"
+        "ext-mongodb": ">=0.5.1"
     },
     "require-dev": {
         "fzaninotto/faker": "~1.0"
diff --git a/src/Client.php b/src/Client.php
index f83f0b87f..572a610f0 100644
--- a/src/Client.php
+++ b/src/Client.php
@@ -7,7 +7,8 @@
 use MongoDB\Driver\Manager;
 use MongoDB\Driver\ReadPreference;
 use MongoDB\Driver\WriteConcern;
-use ArrayIterator;
+use MongoDB\Model\DatabaseInfoIterator;
+use MongoDB\Model\DatabaseInfoLegacyIterator;
 use stdClass;
 use UnexpectedValueException;
 
@@ -54,7 +55,7 @@ public function dropDatabase($databaseName)
      * List databases.
      *
      * @see http://docs.mongodb.org/manual/reference/command/listDatabases/
-     * @return Traversable
+     * @return DatabaseInfoIterator
      * @throws UnexpectedValueException if the command result is malformed
      */
     public function listDatabases()
@@ -62,24 +63,20 @@ public function listDatabases()
         $command = new Command(array('listDatabases' => 1));
 
         $cursor = $this->manager->executeCommand('admin', $command);
+        $cursor->setTypeMap(array('document' => 'array'));
         $result = current($cursor->toArray());
 
         if ( ! isset($result['databases']) || ! is_array($result['databases'])) {
             throw new UnexpectedValueException('listDatabases command did not return a "databases" array');
         }
 
-        $databases = array_map(
-            function(stdClass $database) { return (array) $database; },
-            $result['databases']
-        );
-
-        /* Return a Traversable instead of an array in case listDatabases is
+        /* Return an Iterator instead of an array in case listDatabases is
          * eventually changed to return a command cursor, like the collection
          * and index enumeration commands. This makes the "totalSize" command
          * field inaccessible, but users can manually invoke the command if they
          * need that value.
          */
-        return new ArrayIterator($databases);
+        return new DatabaseInfoLegacyIterator($result['databases']);
     }
 
     /**
diff --git a/src/Collection.php b/src/Collection.php
index 82bc054fa..8512c02cc 100644
--- a/src/Collection.php
+++ b/src/Collection.php
@@ -2,13 +2,19 @@
 
 namespace MongoDB;
 
+use MongoDB\Driver\BulkWrite;
 use MongoDB\Driver\Command;
 use MongoDB\Driver\Cursor;
 use MongoDB\Driver\Manager;
 use MongoDB\Driver\Query;
 use MongoDB\Driver\ReadPreference;
-use MongoDB\Driver\BulkWrite;
+use MongoDB\Driver\Server;
 use MongoDB\Driver\WriteConcern;
+use MongoDB\Exception\InvalidArgumentException;
+use MongoDB\Exception\UnexpectedTypeException;
+use MongoDB\Model\IndexInfoIterator;
+use MongoDB\Model\IndexInfoIteratorIterator;
+use MongoDB\Model\IndexInput;
 
 class Collection
 {
@@ -244,34 +250,68 @@ public function count(array $filter = array(), array $options = array())
     }
 
     /**
-     * Create a single index in the collection.
+     * Create a single index for the collection.
      *
      * @see http://docs.mongodb.org/manual/reference/command/createIndexes/
      * @see http://docs.mongodb.org/manual/reference/method/db.collection.createIndex/
-     * @param array|object $keys
-     * @param array        $options
+     * @see Collection::createIndexes()
+     * @param array|object $key     Document containing fields mapped to values,
+     *                              which denote order or an index type
+     * @param array        $options Index options
      * @return string The name of the created index
      */
-    public function createIndex($keys, array $options = array())
+    public function createIndex($key, array $options = array())
     {
-        // TODO
+        return current($this->createIndexes(array(array('key' => $key) + $options)));
     }
 
     /**
-     * Create multiple indexes in the collection.
+     * Create one or more indexes for the collection.
+     *
+     * Each element in the $indexes array must have a "key" document, which
+     * contains fields mapped to an order or type. Other options may follow.
+     * For example:
+     *
+     *     $indexes = [
+     *         // Create a unique index on the "username" field
+     *         [ 'key' => [ 'username' => 1 ], 'unique' => true ],
+     *         // Create a 2dsphere index on the "loc" field with a custom name
+     *         [ 'key' => [ 'loc' => '2dsphere' ], 'name' => 'geo' ],
+     *     ];
      *
-     * TODO: decide if $models should be an array of associative arrays, using
-     * createIndex()'s parameter names as keys, or tuples, using parameters in
-     * order (e.g. [keys, options]).
+     * If the "name" option is unspecified, a name will be generated from the
+     * "key" document.
      *
      * @see http://docs.mongodb.org/manual/reference/command/createIndexes/
      * @see http://docs.mongodb.org/manual/reference/method/db.collection.createIndex/
-     * @param array $models
+     * @param array $indexes List of index specifications
      * @return string[] The names of the created indexes
+     * @throws InvalidArgumentException if an index specification is invalid
      */
-    public function createIndexes(array $models)
+    public function createIndexes(array $indexes)
     {
-        // TODO
+        if (empty($indexes)) {
+            return array();
+        }
+
+        foreach ($indexes as $i => $index) {
+            if ( ! is_array($index)) {
+                throw new UnexpectedTypeException($index, 'array');
+            }
+
+            if ( ! isset($index['ns'])) {
+                $index['ns'] = $this->ns;
+            }
+
+            $indexes[$i] = new IndexInput($index);
+        }
+
+        $readPreference = new ReadPreference(ReadPreference::RP_PRIMARY);
+        $server = $this->manager->selectServer($readPreference);
+
+        return (FeatureDetection::isSupported($server, FeatureDetection::API_CREATEINDEXES_CMD))
+            ? $this->createIndexesCommand($server, $indexes)
+            : $this->createIndexesLegacy($server, $indexes);
     }
 
     /**
@@ -354,11 +394,24 @@ public function drop()
      * @see http://docs.mongodb.org/manual/reference/method/db.collection.dropIndex/
      * @param string $indexName
      * @return Cursor
-     * @throws InvalidArgumentException if "*" is specified
+     * @throws InvalidArgumentException if $indexName is an empty string or "*"
      */
     public function dropIndex($indexName)
     {
-        // TODO
+        $indexName = (string) $indexName;
+
+        if ($indexName === '') {
+            throw new InvalidArgumentException('Index name cannot be empty');
+        }
+
+        if ($indexName === '*') {
+            throw new InvalidArgumentException('dropIndexes() must be used to drop multiple indexes');
+        }
+
+        $command = new Command(array('dropIndexes' => $this->collname, 'index' => $indexName));
+        $readPreference = new ReadPreference(ReadPreference::RP_PRIMARY);
+
+        return $this->manager->executeCommand($this->dbname, $command, $readPreference);
     }
 
     /**
@@ -370,7 +423,10 @@ public function dropIndex($indexName)
      */
     public function dropIndexes()
     {
-        // TODO
+        $command = new Command(array('dropIndexes' => $this->collname, 'index' => '*'));
+        $readPreference = new ReadPreference(ReadPreference::RP_PRIMARY);
+
+        return $this->manager->executeCommand($this->dbname, $command, $readPreference);
     }
 
     /**
@@ -949,15 +1005,20 @@ public function insertOne(array $document)
     }
 
     /**
-     * Returns information for all indexes in the collection.
+     * Returns information for all indexes for the collection.
      *
      * @see http://docs.mongodb.org/manual/reference/command/listIndexes/
      * @see http://docs.mongodb.org/manual/reference/method/db.collection.getIndexes/
-     * @return Cursor
+     * @return IndexInfoIterator
      */
     public function listIndexes()
     {
-        // TODO
+        $readPreference = new ReadPreference(ReadPreference::RP_PRIMARY);
+        $server = $this->manager->selectServer($readPreference);
+
+        return (FeatureDetection::isSupported($server, FeatureDetection::API_LISTINDEXES_CMD))
+            ? $this->listIndexesCommand($server)
+            : $this->listIndexesLegacy($server);
     }
 
     /**
@@ -1136,4 +1197,78 @@ protected function _update($filter, $update, $options)
         $bulk->update($filter, $update, $options);
         return $this->manager->executeBulkWrite($this->ns, $bulk, $this->wc);
     }
+
+    /**
+     * Create one or more indexes for the collection using the createIndexes
+     * command.
+     *
+     * @param Server       $server
+     * @param IndexInput[] $indexes
+     * @return string[] The names of the created indexes
+     */
+    private function createIndexesCommand(Server $server, array $indexes)
+    {
+        $command = new Command(array(
+            'createIndexes' => $this->collname,
+            'indexes' => $indexes,
+        ));
+        $server->executeCommand($this->dbname, $command);
+
+        return array_map(function(IndexInput $index) { return (string) $index; }, $indexes);
+    }
+
+    /**
+     * Create one or more indexes for the collection by inserting into the
+     * "system.indexes" collection (MongoDB <2.6).
+     *
+     * @param Server       $server
+     * @param IndexInput[] $indexes
+     * @return string[] The names of the created indexes
+     */
+    private function createIndexesLegacy(Server $server, array $indexes)
+    {
+        $bulk = new BulkWrite(true);
+
+        foreach ($indexes as $index) {
+            // TODO: Remove this once PHPC-274 is resolved (see: PHPLIB-87)
+            $bulk->insert($index->bsonSerialize());
+        }
+
+        $server->executeBulkWrite($this->dbname . '.system.indexes', $bulk);
+
+        return array_map(function(IndexInput $index) { return (string) $index; }, $indexes);
+    }
+
+    /**
+     * Returns information for all indexes for this collection using the
+     * listIndexes command.
+     *
+     * @see http://docs.mongodb.org/manual/reference/command/listIndexes/
+     * @param Server $server
+     * @return IndexInfoIteratorIterator
+     */
+    private function listIndexesCommand(Server $server)
+    {
+        $command = new Command(array('listIndexes' => $this->collname));
+        $cursor = $server->executeCommand($this->dbname, $command);
+        $cursor->setTypeMap(array('document' => 'array'));
+
+        return new IndexInfoIteratorIterator($cursor);
+    }
+
+    /**
+     * Returns information for all indexes for this collection by querying the
+     * "system.indexes" collection (MongoDB <2.8).
+     *
+     * @param Server $server
+     * @return IndexInfoIteratorIterator
+     */
+    private function listIndexesLegacy(Server $server)
+    {
+        $query = new Query(array('ns' => $this->ns));
+        $cursor = $server->executeQuery($this->dbname . '.system.indexes', $query);
+        $cursor->setTypeMap(array('document' => 'array'));
+
+        return new IndexInfoIteratorIterator($cursor);
+    }
 }
diff --git a/src/Database.php b/src/Database.php
index 1da5d90db..bbee8dc0b 100644
--- a/src/Database.php
+++ b/src/Database.php
@@ -101,10 +101,7 @@ public function listCollections(array $options = array())
         $readPreference = new ReadPreference(ReadPreference::RP_PRIMARY);
         $server = $this->manager->selectServer($readPreference);
 
-        $serverInfo = $server->getInfo();
-        $maxWireVersion = isset($serverInfo['maxWireVersion']) ? $serverInfo['maxWireVersion'] : 0;
-
-        return ($maxWireVersion >= 3)
+        return (FeatureDetection::isSupported($server, FeatureDetection::API_LISTCOLLECTIONS_CMD))
             ? $this->listCollectionsCommand($server, $options)
             : $this->listCollectionsLegacy($server, $options);
     }
@@ -141,13 +138,14 @@ private function listCollectionsCommand(Server $server, array $options = array()
     {
         $command = new Command(array('listCollections' => 1) + $options);
         $cursor = $server->executeCommand($this->databaseName, $command);
+        $cursor->setTypeMap(array('document' => 'array'));
 
         return new CollectionInfoCommandIterator($cursor);
     }
 
     /**
-     * Returns information for all collections in this database by querying
-     * the "system.namespaces" collection (MongoDB <2.8).
+     * Returns information for all collections in this database by querying the
+     * "system.namespaces" collection (MongoDB <2.8).
      *
      * @param Server $server
      * @param array  $options
@@ -177,6 +175,7 @@ private function listCollectionsLegacy(Server $server, array $options = array())
         $namespace = $this->databaseName . '.system.namespaces';
         $query = new Query($filter);
         $cursor = $server->executeQuery($namespace, $query);
+        $cursor->setTypeMap(array('document' => 'array'));
 
         return new CollectionInfoLegacyIterator($cursor);
     }
diff --git a/src/Exception/BadMethodCallException.php b/src/Exception/BadMethodCallException.php
new file mode 100644
index 000000000..331c3b08d
--- /dev/null
+++ b/src/Exception/BadMethodCallException.php
@@ -0,0 +1,7 @@
+<?php
+
+namespace MongoDB\Exception;
+
+class BadMethodCallException extends \BadMethodCallException implements Exception
+{
+}
diff --git a/src/Exception/Exception.php b/src/Exception/Exception.php
new file mode 100644
index 000000000..bf6158423
--- /dev/null
+++ b/src/Exception/Exception.php
@@ -0,0 +1,7 @@
+<?php
+
+namespace MongoDB\Exception;
+
+interface Exception
+{
+}
diff --git a/src/Exception/InvalidArgumentException.php b/src/Exception/InvalidArgumentException.php
new file mode 100644
index 000000000..a8fdd2e21
--- /dev/null
+++ b/src/Exception/InvalidArgumentException.php
@@ -0,0 +1,7 @@
+<?php
+
+namespace MongoDB\Exception;
+
+class InvalidArgumentException extends \InvalidArgumentException implements Exception
+{
+}
diff --git a/src/Exception/UnexpectedTypeException.php b/src/Exception/UnexpectedTypeException.php
new file mode 100644
index 000000000..4c8adac70
--- /dev/null
+++ b/src/Exception/UnexpectedTypeException.php
@@ -0,0 +1,11 @@
+<?php
+
+namespace MongoDB\Exception;
+
+class UnexpectedTypeException extends InvalidArgumentException
+{
+    public function __construct($value, $expectedType)
+    {
+        parent::__construct(sprintf('Expected argument of type "%s", "%s" given', $expectedType, is_object($value) ? get_class($value) : gettype($value)));
+    }
+}
diff --git a/src/FeatureDetection.php b/src/FeatureDetection.php
new file mode 100644
index 000000000..51b6783de
--- /dev/null
+++ b/src/FeatureDetection.php
@@ -0,0 +1,33 @@
+<?php
+
+namespace MongoDB;
+
+use MongoDB\Driver\Server;
+
+/**
+ * Utility class for detecting features based on wire protocol versions.
+ *
+ * @internal
+ */
+class FeatureDetection
+{
+    const API_LISTCOLLECTIONS_CMD = 3;
+    const API_LISTINDEXES_CMD = 3;
+    const API_CREATEINDEXES_CMD = 2;
+
+    /**
+     * Return whether the server supports a particular feature.
+     *
+     * @param Server  $server  Server to check
+     * @param integer $feature Feature constant (i.e. wire protocol version)
+     * @return boolean
+     */
+    static public function isSupported(Server $server, $feature)
+    {
+        $info = $server->getInfo();
+        $maxWireVersion = isset($info['maxWireVersion']) ? (integer) $info['maxWireVersion'] : 0;
+        $minWireVersion = isset($info['minWireVersion']) ? (integer) $info['minWireVersion'] : 0;
+
+        return ($minWireVersion <= $feature && $maxWireVersion >= $feature);
+    }
+}
diff --git a/src/Model/CollectionInfo.php b/src/Model/CollectionInfo.php
index 9617250ad..318c5e5c2 100644
--- a/src/Model/CollectionInfo.php
+++ b/src/Model/CollectionInfo.php
@@ -2,10 +2,20 @@
 
 namespace MongoDB\Model;
 
+/**
+ * Collection information model class.
+ *
+ * This class models the collection information returned by the listCollections
+ * command or, for legacy servers, queries on the "system.namespaces"
+ * collection. It provides methods to access options for the collection.
+ *
+ * @api
+ * @see MongoDB\Database::listCollections()
+ * @see https://github.com/mongodb/specifications/blob/master/source/enumerate-collections.rst
+ */
 class CollectionInfo
 {
-    private $name;
-    private $options;
+    private $info;
 
     /**
     * Constructor.
@@ -14,8 +24,7 @@ class CollectionInfo
     */
     public function __construct(array $info)
     {
-        $this->name = (string) $info['name'];
-        $this->options = isset($info['options']) ? (array) $info['options'] : array();
+        $this->info = $info;
     }
 
     /**
@@ -25,7 +34,7 @@ public function __construct(array $info)
      */
     public function getName()
     {
-        return $this->name;
+        return (string) $this->info['name'];
     }
 
     /**
@@ -35,7 +44,7 @@ public function getName()
      */
     public function getOptions()
     {
-        return $this->options;
+        return isset($this->info['options']) ? (array) $this->info['options'] : array();
     }
 
     /**
@@ -45,7 +54,7 @@ public function getOptions()
      */
     public function isCapped()
     {
-        return isset($this->options['capped']) ? (boolean) $this->options['capped'] : false;
+        return ! empty($this->info['options']['capped']);
     }
 
     /**
@@ -55,7 +64,7 @@ public function isCapped()
      */
     public function getCappedMax()
     {
-        return isset($this->options['max']) ? (integer) $this->options['max'] : null;
+        return isset($this->info['options']['max']) ? (integer) $this->info['options']['max'] : null;
     }
 
     /**
@@ -65,6 +74,6 @@ public function getCappedMax()
      */
     public function getCappedSize()
     {
-        return isset($this->options['size']) ? (integer) $this->options['size'] : null;
+        return isset($this->info['options']['size']) ? (integer) $this->info['options']['size'] : null;
     }
 }
diff --git a/src/Model/CollectionInfoCommandIterator.php b/src/Model/CollectionInfoCommandIterator.php
index ce0c28737..b0dc98684 100644
--- a/src/Model/CollectionInfoCommandIterator.php
+++ b/src/Model/CollectionInfoCommandIterator.php
@@ -4,11 +4,24 @@
 
 use IteratorIterator;
 
+/**
+ * CollectionInfoIterator for listCollections command results.
+ *
+ * This iterator may be used to wrap a Cursor returned by the listCollections
+ * command.
+ *
+ * @internal
+ * @see MongoDB\Database::listCollections()
+ * @see https://github.com/mongodb/specifications/blob/master/source/enumerate-collections.rst
+ * @see http://docs.mongodb.org/manual/reference/command/listCollections/
+ */
 class CollectionInfoCommandIterator extends IteratorIterator implements CollectionInfoIterator
 {
     /**
      * Return the current element as a CollectionInfo instance.
      *
+     * @see CollectionInfoIterator::current()
+     * @see http://php.net/iterator.current
      * @return CollectionInfo
      */
     public function current()
diff --git a/src/Model/CollectionInfoIterator.php b/src/Model/CollectionInfoIterator.php
index f9e0b6135..0c904d3ab 100644
--- a/src/Model/CollectionInfoIterator.php
+++ b/src/Model/CollectionInfoIterator.php
@@ -4,6 +4,14 @@
 
 use Iterator;
 
+/**
+ * CollectionInfoIterator interface.
+ *
+ * This iterator is used for enumerating collections in a database.
+ *
+ * @api
+ * @see MongoDB\Database::listCollections()
+ */
 interface CollectionInfoIterator extends Iterator
 {
     /**
diff --git a/src/Model/CollectionInfoLegacyIterator.php b/src/Model/CollectionInfoLegacyIterator.php
index 4426def61..01a6a33df 100644
--- a/src/Model/CollectionInfoLegacyIterator.php
+++ b/src/Model/CollectionInfoLegacyIterator.php
@@ -7,6 +7,20 @@
 use IteratorIterator;
 use Traversable;
 
+/**
+ * CollectionInfoIterator for legacy "system.namespaces" query results.
+ *
+ * This iterator may be used to wrap a Cursor returned for queries on the
+ * "system.namespaces" collection. It includes logic to filter out internal
+ * collections and modify the collection name to be consistent with results from
+ * the listCollections command.
+ *
+ * @internal
+ * @see MongoDB\Database::listCollections()
+ * @see https://github.com/mongodb/specifications/blob/master/source/enumerate-collections.rst
+ * @see http://docs.mongodb.org/manual/reference/command/listCollections/
+ * @see http://docs.mongodb.org/manual/reference/system-collections/
+ */
 class CollectionInfoLegacyIterator extends FilterIterator implements CollectionInfoIterator
 {
     /**
@@ -29,6 +43,8 @@ public function __construct(Traversable $iterator)
     /**
      * Return the current element as a CollectionInfo instance.
      *
+     * @see CollectionInfoIterator::current()
+     * @see http://php.net/iterator.current
      * @return CollectionInfo
      */
     public function current()
@@ -48,7 +64,7 @@ public function current()
     /**
      * Filter out internal or invalid collections.
      *
-     * @see http://php.net/manual/en/filteriterator.accept.php
+     * @see http://php.net/filteriterator.accept
      * @return boolean
      */
     public function accept()
diff --git a/src/Model/DatabaseInfo.php b/src/Model/DatabaseInfo.php
new file mode 100644
index 000000000..b304ab63a
--- /dev/null
+++ b/src/Model/DatabaseInfo.php
@@ -0,0 +1,58 @@
+<?php
+
+namespace MongoDB\Model;
+
+/**
+ * Database information model class.
+ *
+ * This class models the database information returned by the listDatabases
+ * command. It provides methods to access common database properties.
+ *
+ * @api
+ * @see MongoDB\Client::listDatabases()
+ * @see http://docs.mongodb.org/manual/reference/command/listDatabases/
+ */
+class DatabaseInfo
+{
+    private $info;
+
+    /**
+    * Constructor.
+    *
+    * @param array $info Database info
+    */
+    public function __construct(array $info)
+    {
+        $this->info = $info;
+    }
+
+    /**
+     * Return the database name.
+     *
+     * @return string
+     */
+    public function getName()
+    {
+        return (string) $this->info['name'];
+    }
+
+    /**
+     * Return the databases size on disk (in bytes).
+     *
+     * @return integer
+     */
+    public function getSizeOnDisk()
+    {
+        return (integer) $this->info['sizeOnDisk'];
+    }
+
+    /**
+     * Return whether the database is empty.
+     *
+     * @return boolean
+     */
+    public function isEmpty()
+    {
+        return (boolean) $this->info['empty'];
+    }
+}
diff --git a/src/Model/DatabaseInfoIterator.php b/src/Model/DatabaseInfoIterator.php
new file mode 100644
index 000000000..e18ef18aa
--- /dev/null
+++ b/src/Model/DatabaseInfoIterator.php
@@ -0,0 +1,23 @@
+<?php
+
+namespace MongoDB\Model;
+
+use Iterator;
+
+/**
+ * DatabaseInfoIterator interface.
+ *
+ * This iterator is used for enumerating databases on a server.
+ *
+ * @api
+ * @see MongoDB\Client::listDatabases()
+ */
+interface DatabaseInfoIterator extends Iterator
+{
+    /**
+     * Return the current element as a DatabaseInfo instance.
+     *
+     * @return DatabaseInfo
+     */
+    public function current();
+}
diff --git a/src/Model/DatabaseInfoLegacyIterator.php b/src/Model/DatabaseInfoLegacyIterator.php
new file mode 100644
index 000000000..af1421ba6
--- /dev/null
+++ b/src/Model/DatabaseInfoLegacyIterator.php
@@ -0,0 +1,83 @@
+<?php
+
+namespace MongoDB\Model;
+
+/**
+ * DatabaseInfoIterator for inline listDatabases command results.
+ *
+ * This iterator may be used to wrap the array returned within the listDatabases
+ * command's single-document result.
+ *
+ * @internal
+ * @see MongoDB\Client::listDatabases()
+ * @see http://docs.mongodb.org/manual/reference/command/listDatabases/
+ */
+class DatabaseInfoLegacyIterator implements DatabaseInfoIterator
+{
+    private $databases;
+    private $index = 0;
+
+    /**
+     * Constructor.
+     *
+     * @param array $databases
+     */
+    public function __construct(array $databases)
+    {
+        $this->databases = $databases;
+    }
+
+    /**
+     * Return the current element as a DatabaseInfo instance.
+     *
+     * @see DatabaseInfoIterator::current()
+     * @see http://php.net/iterator.current
+     * @return DatabaseInfo
+     */
+    public function current()
+    {
+        return new DatabaseInfo(current($this->databases));
+    }
+
+    /**
+     * Return the key of the current element.
+     *
+     * @see http://php.net/iterator.key
+     * @return integer
+     */
+    public function key()
+    {
+        return key($this->databases);
+    }
+
+    /**
+     * Move forward to next element.
+     *
+     * @see http://php.net/iterator.next
+     */
+    public function next()
+    {
+        next($this->databases);
+    }
+
+    /**
+     * Rewind the Iterator to the first element.
+     *
+     * @see http://php.net/iterator.rewind
+     */
+    public function rewind()
+    {
+        reset($this->databases);
+    }
+
+    /**
+     * Checks if current position is valid.
+     *
+     * @see http://php.net/iterator.valid
+     * @return boolean
+     */
+    public function valid()
+    {
+        return key($this->databases) !== null;
+    }
+}
diff --git a/src/Model/IndexInfo.php b/src/Model/IndexInfo.php
new file mode 100644
index 000000000..685298d7c
--- /dev/null
+++ b/src/Model/IndexInfo.php
@@ -0,0 +1,160 @@
+<?php
+
+namespace MongoDB\Model;
+
+use MongoDB\Exception\BadMethodCallException;
+use ArrayAccess;
+
+/**
+ * Index information model class.
+ *
+ * This class models the index information returned by the listIndexes command
+ * or, for legacy servers, queries on the "system.indexes" collection. It
+ * provides methods to access common index options, and allows access to other
+ * options through the ArrayAccess interface (write methods are not supported).
+ * For information on keys and index options, see the referenced
+ * db.collection.createIndex() documentation.
+ *
+ * @api
+ * @see MongoDB\Collection::listIndexes()
+ * @see https://github.com/mongodb/specifications/blob/master/source/enumerate-indexes.rst
+ * @see http://docs.mongodb.org/manual/reference/method/db.collection.createIndex/
+ */
+class IndexInfo implements ArrayAccess
+{
+    private $info;
+
+    /**
+    * Constructor.
+    *
+    * @param array $info Index info
+    */
+    public function __construct(array $info)
+    {
+        $this->info = $info;
+    }
+
+    /**
+     * Return the index key(s).
+     *
+     * @return array
+     */
+    public function getKeys()
+    {
+        return (array) $this->info['key'];
+    }
+
+    /**
+     * Return the index name.
+     *
+     * @return string
+     */
+    public function getName()
+    {
+        return (string) $this->info['name'];
+    }
+
+    /**
+     * Return the index namespace (e.g. "db.collection").
+     *
+     * @return string
+     */
+    public function getNamespace()
+    {
+        return (string) $this->info['ns'];
+    }
+
+    /**
+     * Return the index version.
+     *
+     * @return integer
+     */
+    public function getVersion()
+    {
+        return (integer) $this->info['v'];
+    }
+
+    /**
+     * Return whether this is a sparse index.
+     *
+     * @see http://docs.mongodb.org/manual/core/index-sparse/
+     * @return boolean
+     */
+    public function isSparse()
+    {
+        return ! empty($this->info['sparse']);
+    }
+
+    /**
+     * Return whether this is a TTL index.
+     *
+     * @see http://docs.mongodb.org/manual/core/index-ttl/
+     * @return boolean
+     */
+    public function isTtl()
+    {
+        return array_key_exists('expireAfterSeconds', $this->info);
+    }
+
+    /**
+     * Return whether this is a unique index.
+     *
+     * @see http://docs.mongodb.org/manual/core/index-unique/
+     * @return boolean
+     */
+    public function isUnique()
+    {
+        return ! empty($this->info['unique']);
+    }
+
+    /**
+     * Check whether a field exists in the index information.
+     *
+     * @see http://php.net/arrayaccess.offsetexists
+     * @param mixed $key
+     * @return boolean
+     */
+    public function offsetExists($key)
+    {
+        return array_key_exists($key, $this->info);
+    }
+
+    /**
+     * Return the field's value from the index information.
+     *
+     * This method satisfies the Enumerating Indexes specification's requirement
+     * that index fields be made accessible under their original names. It may
+     * also be used to access fields that do not have a helper method.
+     *
+     * @see http://php.net/arrayaccess.offsetget
+     * @see https://github.com/mongodb/specifications/blob/master/source/enumerate-indexes.rst#getting-full-index-information
+     * @param mixed $key
+     * @return mixed
+     */
+    public function offsetGet($key)
+    {
+        return $this->data[$key];
+    }
+
+    /**
+     * Not supported.
+     *
+     * @see http://php.net/arrayaccess.offsetset
+     * @throws BadMethodCallException IndexInfo is immutable
+     */
+    public function offsetSet($key, $value)
+    {
+        throw new BadMethodCallException('IndexInfo is immutable');
+    }
+
+    /**
+     * Not supported.
+     *
+     * @see http://php.net/arrayaccess.offsetunset
+     * @throws BadMethodCallException IndexInfo is immutable
+     */
+    public function offsetUnset($key)
+    {
+        throw new BadMethodCallException('IndexInfo is immutable');
+    }
+}
diff --git a/src/Model/IndexInfoIterator.php b/src/Model/IndexInfoIterator.php
new file mode 100644
index 000000000..e4275bb66
--- /dev/null
+++ b/src/Model/IndexInfoIterator.php
@@ -0,0 +1,23 @@
+<?php
+
+namespace MongoDB\Model;
+
+use Iterator;
+
+/**
+ * IndexInfoIterator interface.
+ *
+ * This iterator is used for enumerating indexes in a collection.
+ *
+ * @api
+ * @see MongoDB\Collection::listIndexes()
+ */
+interface IndexInfoIterator extends Iterator
+{
+    /**
+     * Return the current element as a IndexInfo instance.
+     *
+     * @return IndexInfo
+     */
+    public function current();
+}
diff --git a/src/Model/IndexInfoIteratorIterator.php b/src/Model/IndexInfoIteratorIterator.php
new file mode 100644
index 000000000..2ae008de1
--- /dev/null
+++ b/src/Model/IndexInfoIteratorIterator.php
@@ -0,0 +1,33 @@
+<?php
+
+namespace MongoDB\Model;
+
+use IteratorIterator;
+
+/**
+ * IndexInfoIterator for both listIndexes command and legacy query results.
+ *
+ * This common iterator may be used to wrap a Cursor returned by both the
+ * listIndexes command and, for legacy servers, queries on the "system.indexes"
+ * collection.
+ *
+ * @internal
+ * @see MongoDB\Collection::listIndexes()
+ * @see https://github.com/mongodb/specifications/blob/master/source/enumerate-indexes.rst
+ * @see http://docs.mongodb.org/manual/reference/command/listIndexes/
+ * @see http://docs.mongodb.org/manual/reference/system-collections/
+ */
+class IndexInfoIteratorIterator extends IteratorIterator implements IndexInfoIterator
+{
+    /**
+     * Return the current element as an IndexInfo instance.
+     *
+     * @see IndexInfoIterator::current()
+     * @see http://php.net/iterator.current
+     * @return IndexInfo
+     */
+    public function current()
+    {
+        return new IndexInfo(parent::current());
+    }
+}
diff --git a/src/Model/IndexInput.php b/src/Model/IndexInput.php
new file mode 100644
index 000000000..03398ae7d
--- /dev/null
+++ b/src/Model/IndexInput.php
@@ -0,0 +1,99 @@
+<?php
+
+namespace MongoDB\Model;
+
+use BSON\Serializable;
+
+/**
+ * Index input model class.
+ *
+ * This class is used to validate user input for index creation.
+ *
+ * @internal
+ * @see MongoDB\Collection::createIndexes()
+ * @see https://github.com/mongodb/specifications/blob/master/source/enumerate-indexes.rst
+ * @see http://docs.mongodb.org/manual/reference/method/db.collection.createIndex/
+ */
+class IndexInput implements Serializable
+{
+    private $index;
+
+    /**
+    * Constructor.
+    *
+    * @param array $index Index specification
+    */
+    public function __construct(array $index)
+    {
+        if ( ! isset($index['key'])) {
+            throw new InvalidArgumentException('Required "key" document is missing from index specification');
+        }
+
+        if ( ! is_array($index['key']) && ! is_object($index['key'])) {
+            throw new UnexpectedTypeException($index['key'], 'array or object');
+        }
+
+        foreach ($index['key'] as $order) {
+            if ( ! is_int($order) && ! is_float($order) && ! is_string($order)) {
+                throw new UnexpectedTypeException($order, 'numeric or string');
+            }
+        }
+
+        if ( ! isset($index['ns'])) {
+            throw new InvalidArgumentException('Required "ns" option is missing from index specification');
+        }
+
+        if ( ! is_string($index['ns'])) {
+            throw new UnexpectedTypeException($index['ns'], 'string');
+        }
+
+        if ( ! isset($index['name'])) {
+            $index['name'] = $this->generateName($index['key']);
+        }
+
+        if ( ! is_string($index['name'])) {
+            throw new UnexpectedTypeException($index['name'], 'string');
+        }
+
+        $this->index = $index;
+    }
+
+    /**
+     * Serialize the index information to BSON for index creation.
+     *
+     * @see MongoDB\Collection::createIndexes()
+     * @see http://php.net/bson-serializable.bsonserialize
+     */
+    public function bsonSerialize()
+    {
+        return $this->index;
+    }
+
+    /**
+     * Return the index name.
+     *
+     * @param string
+     */
+    public function __toString()
+    {
+        return $this->index['name'];
+    }
+
+    /**
+     * Generates an index name from its key specification.
+     *
+     * @param array|object $key Document containing fields mapped to values,
+     *                          which denote order or an index type
+     * @return string
+     */
+    private function generateName($key)
+    {
+        $name = '';
+
+        foreach ($key as $field => $type) {
+            $name .= ($name != '' ? '_' : '') . $field . '_' . $type;
+        }
+
+        return $name;
+    }
+}
diff --git a/tests/ClientFunctionalTest.php b/tests/ClientFunctionalTest.php
index 06b67f169..a7f3fe4ee 100644
--- a/tests/ClientFunctionalTest.php
+++ b/tests/ClientFunctionalTest.php
@@ -3,19 +3,30 @@
 namespace MongoDB\Tests;
 
 use MongoDB\Client;
+use MongoDB\Driver\Command;
+use MongoDB\Model\DatabaseInfo;
 
 /**
  * Functional tests for the Client class.
  */
 class ClientFunctionalTest extends FunctionalTestCase
 {
+    private $client;
+
+    public function setUp()
+    {
+        parent::setUp();
+
+        $this->client = new Client($this->getUri());
+        $this->client->dropDatabase($this->getDatabaseName());
+    }
+
     public function testDropDatabase()
     {
         $writeResult = $this->manager->executeInsert($this->getNamespace(), array('x' => 1));
         $this->assertEquals(1, $writeResult->getInsertedCount());
 
-        $client = new Client($this->getUri());
-        $commandResult = $client->dropDatabase($this->getDatabaseName());
+        $commandResult = $this->client->dropDatabase($this->getDatabaseName());
         $this->assertCommandSucceeded($commandResult);
         $this->assertCollectionCount($this->getNamespace(), 0);
     }
@@ -25,22 +36,52 @@ public function testListDatabases()
         $writeResult = $this->manager->executeInsert($this->getNamespace(), array('x' => 1));
         $this->assertEquals(1, $writeResult->getInsertedCount());
 
-        $client = new Client($this->getUri());
-        $databases = $client->listDatabases();
+        $databases = $this->client->listDatabases();
+
+        $this->assertInstanceOf('MongoDB\Model\DatabaseInfoIterator', $databases);
+
+        foreach ($databases as $database) {
+            $this->assertInstanceOf('MongoDB\Model\DatabaseInfo', $database);
+        }
+
+        $that = $this;
+        $this->assertDatabaseExists($this->getDatabaseName(), function(DatabaseInfo $info) use ($that) {
+            $that->assertFalse($info->isEmpty());
+            $that->assertGreaterThan(0, $info->getSizeOnDisk());
+        });
+    }
+
+    /**
+     * Asserts that a database with the given name exists on the server.
+     *
+     * An optional $callback may be provided, which should take a DatabaseInfo
+     * argument as its first and only parameter. If a DatabaseInfo matching
+     * the given name is found, it will be passed to the callback, which may
+     * perform additional assertions.
+     *
+     * @param callable $callback
+     */
+    private function assertDatabaseExists($databaseName, $callback = null)
+    {
+        if ($callback !== null && ! is_callable($callback)) {
+            throw new InvalidArgumentException('$callback is not a callable');
+        }
 
-        $this->assertInstanceOf('Traversable', $databases);
+        $databases = $this->client->listDatabases();
 
         $foundDatabase = null;
 
         foreach ($databases as $database) {
-            if ($database['name'] === $this->getDatabaseName()) {
+            if ($database->getName() === $databaseName) {
                 $foundDatabase = $database;
                 break;
             }
         }
 
-        $this->assertNotNull($foundDatabase, 'Found test database in list of databases');
-        $this->assertFalse($foundDatabase['empty'], 'Test database is not empty');
-        $this->assertGreaterThan(0, $foundDatabase['sizeOnDisk'], 'Test database takes up disk space');
+        $this->assertNotNull($foundDatabase, sprintf('Found %s database on the server', $databaseName));
+
+        if ($callback !== null) {
+            call_user_func($callback, $foundDatabase);
+        }
     }
 }
diff --git a/tests/CollectionFunctionalTest.php b/tests/CollectionFunctionalTest.php
index 4d3bc5d20..7c3bd0300 100644
--- a/tests/CollectionFunctionalTest.php
+++ b/tests/CollectionFunctionalTest.php
@@ -4,6 +4,8 @@
 
 use MongoDB\Collection;
 use MongoDB\Driver\Manager;
+use MongoDB\Model\IndexInfo;
+use InvalidArgumentException;
 
 class CollectionFunctionalTest extends FunctionalTestCase
 {
@@ -56,4 +58,180 @@ function testInsertAndRetrieve()
         }
         $this->assertEquals(0, $n);
     }
+
+    public function testCreateIndex()
+    {
+        $that = $this;
+
+        $this->assertSame('x_1', $this->collection->createIndex(array('x' => 1), array('sparse' => true, 'unique' => true)));
+        $this->assertIndexExists('x_1', function(IndexInfo $info) use ($that) {
+            $that->assertTrue($info->isSparse());
+            $that->assertTrue($info->isUnique());
+            $that->assertFalse($info->isTtl());
+        });
+
+        $this->assertSame('y_-1_z_1', $this->collection->createIndex(array('y' => -1, 'z' => 1)));
+        $this->assertIndexExists('y_-1_z_1', function(IndexInfo $info) use ($that) {
+            $that->assertFalse($info->isSparse());
+            $that->assertFalse($info->isUnique());
+            $that->assertFalse($info->isTtl());
+        });
+
+        $this->assertSame('g_2dsphere_z_1', $this->collection->createIndex(array('g' => '2dsphere', 'z' => 1)));
+        $this->assertIndexExists('g_2dsphere_z_1', function(IndexInfo $info) use ($that) {
+            $that->assertFalse($info->isSparse());
+            $that->assertFalse($info->isUnique());
+            $that->assertFalse($info->isTtl());
+        });
+
+        $this->assertSame('my_ttl', $this->collection->createIndex(array('t' => 1), array('expireAfterSeconds' => 0, 'name' => 'my_ttl')));
+        $this->assertIndexExists('my_ttl', function(IndexInfo $info) use ($that) {
+            $that->assertFalse($info->isSparse());
+            $that->assertFalse($info->isUnique());
+            $that->assertTrue($info->isTtl());
+        });
+    }
+
+    public function testCreateIndexes()
+    {
+        $that = $this;
+
+        $expectedNames = array('x_1', 'y_-1_z_1', 'g_2dsphere_z_1', 'my_ttl');
+
+        $indexes = array(
+            array('key' => array('x' => 1), 'sparse' => true, 'unique' => true),
+            array('key' => array('y' => -1, 'z' => 1)),
+            array('key' => array('g' => '2dsphere', 'z' => 1)),
+            array('key' => array('t' => 1), 'expireAfterSeconds' => 0, 'name' => 'my_ttl'),
+        );
+
+        $this->assertSame($expectedNames, $this->collection->createIndexes($indexes));
+
+        $this->assertIndexExists('x_1', function(IndexInfo $info) use ($that) {
+            $that->assertTrue($info->isSparse());
+            $that->assertTrue($info->isUnique());
+            $that->assertFalse($info->isTtl());
+        });
+
+        $this->assertIndexExists('y_-1_z_1', function(IndexInfo $info) use ($that) {
+            $that->assertFalse($info->isSparse());
+            $that->assertFalse($info->isUnique());
+            $that->assertFalse($info->isTtl());
+        });
+
+        $this->assertIndexExists('g_2dsphere_z_1', function(IndexInfo $info) use ($that) {
+            $that->assertFalse($info->isSparse());
+            $that->assertFalse($info->isUnique());
+            $that->assertFalse($info->isTtl());
+        });
+
+        $this->assertIndexExists('my_ttl', function(IndexInfo $info) use ($that) {
+            $that->assertFalse($info->isSparse());
+            $that->assertFalse($info->isUnique());
+            $that->assertTrue($info->isTtl());
+        });
+    }
+
+    public function testCreateIndexesWithEmptyInputIsNop()
+    {
+        $this->assertSame(array(), $this->collection->createIndexes(array()));
+    }
+
+    public function testDropIndex()
+    {
+        $this->assertSame('x_1', $this->collection->createIndex(array('x' => 1)));
+        $this->assertIndexExists('x_1');
+        $this->assertCommandSucceeded($this->collection->dropIndex('x_1'));
+
+        foreach ($this->collection->listIndexes() as $index) {
+            if ($index->getName() === 'x_1') {
+                $this->fail('The "x_1" index should have been deleted');
+            }
+        }
+    }
+
+    /**
+     * @expectedException MongoDB\Exception\InvalidArgumentException
+     */
+    public function testDropIndexShouldNotAllowEmptyIndexName()
+    {
+        $this->assertSame('x_1', $this->collection->createIndex(array('x' => 1)));
+        $this->assertIndexExists('x_1');
+        $this->collection->dropIndex('');
+    }
+
+    /**
+     * @expectedException MongoDB\Exception\InvalidArgumentException
+     */
+    public function testDropIndexShouldNotAllowWildcardCharacter()
+    {
+        $this->assertSame('x_1', $this->collection->createIndex(array('x' => 1)));
+        $this->assertIndexExists('x_1');
+        $this->collection->dropIndex('*');
+    }
+
+    public function testDropIndexes()
+    {
+        $this->assertSame('x_1', $this->collection->createIndex(array('x' => 1)));
+        $this->assertSame('y_1', $this->collection->createIndex(array('y' => 1)));
+        $this->assertIndexExists('x_1');
+        $this->assertIndexExists('y_1');
+        $this->assertCommandSucceeded($this->collection->dropIndexes());
+
+        foreach ($this->collection->listIndexes() as $index) {
+            if ($index->getName() === 'x_1') {
+                $this->fail('The "x_1" index should have been deleted');
+            }
+
+            if ($index->getName() === 'y_1') {
+                $this->fail('The "y_1" index should have been deleted');
+            }
+        }
+    }
+
+    public function testListIndexes()
+    {
+        $this->assertSame('x_1', $this->collection->createIndex(array('x' => 1)));
+
+        $indexes = $this->collection->listIndexes();
+        $this->assertInstanceOf('MongoDB\Model\IndexInfoIterator', $indexes);
+
+        foreach ($indexes as $index) {
+            $this->assertInstanceOf('MongoDB\Model\IndexInfo', $index);
+        }
+    }
+
+    /**
+     * Asserts that an index with the given name exists for the collection.
+     *
+     * An optional $callback may be provided, which should take an IndexInfo
+     * argument as its first and only parameter. If an IndexInfo matching the
+     * given name is found, it will be passed to the callback, which may perform
+     * additional assertions.
+     *
+     * @param callable $callback
+     */
+    private function assertIndexExists($indexName, $callback = null)
+    {
+        if ($callback !== null && ! is_callable($callback)) {
+            throw new InvalidArgumentException('$callback is not a callable');
+        }
+
+        $indexes = $this->collection->listIndexes();
+
+        $foundIndex = null;
+
+        foreach ($indexes as $index) {
+            if ($index->getName() === $indexName) {
+                $foundIndex = $index;
+                break;
+            }
+        }
+
+        $this->assertNotNull($foundIndex, sprintf('Found %s index for the collection', $indexName));
+
+        if ($callback !== null) {
+            call_user_func($callback, $foundIndex);
+        }
+    }
 }