diff --git a/lib/IPicoPlugin.php b/lib/IPicoPlugin.php
new file mode 100644
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--- /dev/null
+++ b/lib/IPicoPlugin.php
@@ -0,0 +1,97 @@
+<?php
+
+/**
+ * Common interface for Pico plugins
+ *
+ * For a list of supported events see {@link DummyPlugin}; you can use
+ * {@link DummyPlugin} as template for new plugins. For a list of deprecated
+ * events see {@link PicoDeprecated}.
+ *
+ * You SHOULD NOT use deprecated events when implementing this interface.
+ * Deprecated events are triggered by the {@link PicoDeprecated} plugin, if
+ * plugins which don't implement this interface are loaded. You can take
+ * advantage from this behaviour if you want to do something only when old
+ * plugins are loaded. Consequently the old events are never triggered when
+ * your plugin is implementing this interface and no old plugins are present.
+ *
+ * If you're developing a new plugin, you MUST implement IPicoPlugin. If
+ * you're the developer of an old plugin, it is STRONGLY RECOMMENDED to use
+ * the events introduced in Pico 1.0 when releasing a new version of your
+ * plugin. If you want to use any of the new events, you MUST implement
+ * IPicoPlugin and update all other events you use.
+ *
+ * @author  Daniel Rudolf
+ * @link    http://picocms.org
+ * @license http://opensource.org/licenses/MIT
+ * @version 1.0
+ */
+interface IPicoPlugin
+{
+    /**
+     * Constructs a new instance of a Pico plugin
+     *
+     * @param Pico $pico current instance of Pico
+     */
+    public function __construct(Pico $pico);
+
+    /**
+     * Handles a event that was triggered by Pico
+     *
+     * @param  string $eventName name of the triggered event
+     * @param  array  $params    passed parameters
+     * @return void
+     */
+    public function handleEvent($eventName, array $params);
+
+    /**
+     * Enables or disables this plugin
+     *
+     * @param  boolean $enabled     enable (true) or disable (false) this plugin
+     * @param  boolean $recursive   when true, enable or disable recursively
+     *     In other words, if you enable a plugin, all required plugins are
+     *     enabled, too. When disabling a plugin, all depending plugins are
+     *     disabled likewise. Recursive operations are only performed as long
+     *     as a plugin wasn't enabled/disabled manually. This parameter is
+     *     optional and defaults to true.
+     * @param  boolean $auto        enable or disable to fulfill a dependency
+     *     This parameter is optional and defaults to false.
+     * @return void
+     * @throws RuntimeException     thrown when a dependency fails
+     */
+    public function setEnabled($enabled, $recursive = true, $auto = false);
+
+    /**
+     * Returns true if this plugin is enabled, false otherwise
+     *
+     * @return boolean plugin is enabled (true) or disabled (false)
+     */
+    public function isEnabled();
+
+    /**
+     * Returns true if the plugin was ever enabled/disabled manually
+     *
+     * @return boolean plugin is in its default state (true), false otherwise
+     */
+    public function isStatusChanged();
+
+    /**
+     * Returns a list of names of plugins required by this plugin
+     *
+     * @return array<string> required plugins
+     */
+    public function getDependencies();
+
+    /**
+     * Returns a list of plugins which depend on this plugin
+     *
+     * @return array<object> dependant plugins
+     */
+    public function getDependants();
+
+    /**
+     * Returns the plugins instance of Pico
+     *
+     * @return Pico the plugins instance of Pico
+     */
+    public function getPico();
+}