Five is a Zope 2 product that allows you to integrate Zope 3 technologies.

Five 1.1 brings new Zope 3 features to the Zope 2 world :

**Zope 3-style i18n
**Zope 3 to Zope 2 interface bridging
**More standard ZCML directives.

The code has been restructured and the testing framework has been simplified to be easier to maintain.

Five is a Zope 2 product that allows you to integrate Zope 3 technologies into Zope 2. It allows you to use the following parts of the Zope 3 Component architecture within Zope 2:

**Zope 3 interfaces
**adapters
**pages (views), including skins, layers and resources
**edit and add forms, based on schemas
**i18n
**ZCML

Reference :
www.pythonthreads.com