Subtyping is a new pattern for extending the functionality of existing content types as provided by Plone. Zope 3 enables subtyping using adapters and views. After this session, attendees will be capable of adding additional functionality to content types using subtyping and Zope 3. The Plone4Artists suite of projects will be used to demonstrate existing uses of subtyping. Attendees will be expected to understand the basics of the Zope 3 CA particularly concerning interfaces, adapters, and views. They will also need to understand the basics of ATContentTypes and how they relate to Plone.