diff --git a/src/grokcore/traverser/interfaces.py b/src/grokcore/traverser/interfaces.py
new file mode 100644
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+++ b/src/grokcore/traverser/interfaces.py
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+##############################################################################
+#
+# Copyright (c) 2006-2007 Zope Foundation and Contributors.
+# All Rights Reserved.
+#
+# This software is subject to the provisions of the Zope Public License,
+# Version 2.1 (ZPL).  A copy of the ZPL should accompany this distribution.
+# THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
+# WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+# WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
+# FOR A PARTICULAR PURPOSE.
+#
+##############################################################################
+"""Grok interfaces
+"""
+from zope import interface
+from zope.interface.interfaces import IInterface
+from zope.component.interfaces import IObjectEvent
+from zope.publisher.interfaces.http import IHTTPRequest
+from zope.container.interfaces import IContainer as IContainerBase
+
+# Expose interfaces from grokcore.* packages as well:
+import grokcore.annotation.interfaces
+import grokcore.component.interfaces
+import grokcore.formlib.interfaces
+import grokcore.json.interfaces
+import grokcore.security.interfaces
+import grokcore.site.interfaces
+import grokcore.view.interfaces
+import grokcore.viewlet.interfaces
+
+from grokcore.component.interfaces import IContext
+from grokcore.component.interfaces import IGrokErrors
+
+
+class IGrokBaseClasses(grokcore.annotation.interfaces.IBaseClasses,
+                       grokcore.component.interfaces.IBaseClasses,
+                       grokcore.security.interfaces.IBaseClasses,
+                       grokcore.site.interfaces.IBaseClasses,
+                       grokcore.view.interfaces.IBaseClasses,
+                       grokcore.json.interfaces.IBaseClasses):
+    Model = interface.Attribute("Base class for persistent content objects "
+                                "(models).")
+    Container = interface.Attribute("Base class for containers.")
+    OrderedContainer = interface.Attribute("Base class for ordered containers.")
+    Application = interface.Attribute("Base class for applications.")
+    XMLRPC = interface.Attribute("Base class for XML-RPC methods.")
+    REST = interface.Attribute("Base class for REST views.")
+    Traverser = interface.Attribute("Base class for custom traversers.")
+    Indexes = interface.Attribute("Base class for catalog index definitions.")
+    Role = interface.Attribute("Base class for roles.")
+
+
+class IGrokDirectives(grokcore.component.interfaces.IDirectives,
+                      grokcore.security.interfaces.IDirectives,
+                      grokcore.site.interfaces.IDirectives,
+                      grokcore.view.interfaces.IDirectives):
+
+    def permissions(permissions):
+        """Specify the permissions that comprise a role.
+        """
+
+    def site(class_or_interface):
+        """Specifies the site that an indexes definition is for.
+
+        It can only be used inside grok.Indexes subclasses.
+        """
+
+
+class IGrokEvents(interface.Interface):
+
+    IObjectCreatedEvent = interface.Attribute("")
+
+    ObjectCreatedEvent = interface.Attribute("")
+
+    IObjectModifiedEvent = interface.Attribute("")
+
+    ObjectModifiedEvent = interface.Attribute("")
+
+    IObjectCopiedEvent = interface.Attribute("")
+
+    ObjectCopiedEvent = interface.Attribute("")
+
+    IObjectAddedEvent = interface.Attribute("")
+
+    ObjectAddedEvent = interface.Attribute("")
+
+    IObjectMovedEvent = interface.Attribute("")
+
+    ObjectMovedEvent = interface.Attribute("")
+
+    IObjectRemovedEvent = interface.Attribute("")
+
+    ObjectRemovedEvent = interface.Attribute("")
+
+    IContainerModifiedEvent = interface.Attribute("")
+
+    ContainerModifiedEvent = interface.Attribute("")
+
+    IBeforeTraverseEvent = interface.Attribute("")
+
+    IApplicationInitializedEvent = interface.Attribute("")
+
+    ApplicationInitializedEvent = interface.Attribute("")
+
+
+class IGrokAPI(grokcore.formlib.interfaces.IGrokcoreFormlibAPI,
+               grokcore.security.interfaces.IGrokcoreSecurityAPI,
+               grokcore.site.interfaces.IGrokcoreSiteAPI,
+               grokcore.view.interfaces.IGrokcoreViewAPI,
+               grokcore.viewlet.interfaces.IGrokcoreViewletAPI,
+               IGrokBaseClasses, IGrokDirectives,
+               IGrokEvents, IGrokErrors):
+
+    # BBB this is deprecated
+    def grok(dotted_name):
+        """Grok a module or package specified by ``dotted_name``.
+
+        NOTE: This function will be removed from the public Grok
+        public API.  For tests and interpreter sessions, use
+        grok.testing.grok().
+        """
+
+    # BBB this is deprecated
+    def grok_component(name, component, context=None, module_info=None,
+                       templates=None):
+        """Grok an arbitrary object. Can be useful during testing.
+
+        name - the name of the component (class name, or global instance name
+               as it would appear in a module).
+        component - the object (class, etc) to grok.
+        context - the context object (optional).
+        module_info - the module being grokked (optional).
+        templates - the templates registry (optional).
+
+        Note that context, module_info and templates might be required
+        for some grokkers which rely on them.
+
+        NOTE: This function will be removed from the public Grok
+        public API.  For tests and interpreter sessions, use
+        grok.testing.grok_component().
+        """
+
+    def notify(event):
+        """Send ``event`` to event subscribers."""
+
+    def getSite():
+        """Get the current site."""
+
+    IRESTSkinType = interface.Attribute('The REST skin type')
+
+
+class IGrokView(grokcore.view.interfaces.IGrokView):
+    """Grok views all provide this interface."""
+
+    def application_url(name=None):
+        """Return the URL of the closest application object in the
+        hierarchy or the URL of a named object (``name`` parameter)
+        relative to the closest application object.
+        """
+
+    def flash(message, type='message'):
+        """Send a short message to the user."""
+
+
+class IGrokForm(grokcore.formlib.interfaces.IGrokForm, IGrokView):
+    """All Grok forms provides this interface."""
+
+
+class IREST(interface.Interface):
+    context = interface.Attribute("Object that the REST handler presents.")
+
+    request = interface.Attribute("Request that REST handler was looked"
+                                  "up with.")
+
+    body = interface.Attribute(
+        """The text of the request body.""")
+
+
+class IIndexDefinition(interface.Interface):
+    """Define an index for grok.Indexes.
+    """
+
+    def setup(catalog, name, context):
+        """Set up index called name in given catalog.
+
+        Use name for index name and attribute to index. Set up
+        index for interface or class context.
+        """
+
+
+class IRESTLayer(IHTTPRequest):
+    """REST-specific Request functionality.
+
+    Base Interfaces for defining REST-layers.
+    """
+
+
+class IRESTSkinType(IInterface):
+    """Skin type for REST requests.
+    """
+
+
+class IContainer(IContext, IContainerBase):
+    """A Grok container.
+    """
+
+
+class IApplicationInitializedEvent(IObjectEvent):
+    """A Grok Application has been created with success and is now ready
+    to be used.
+
+    This event can be used to trigger the creation of contents or other tasks
+    that require the application to be fully operational : utilities installed
+    and indexes created in the catalog."""