Features Talk, but Behaviors Close
http://www.cooper.com/content/insights/newsletters/2003_09/Features_talk_but_behaviors_close.asp

Fore, David
Cooper Interaction Design
2003

Abstract:

Features are often the currency of software development and marketing, yet few people can agree on what exactly defines a feature. The term can be used to describe a particular piece of functionality, an entire set of functionality, a capability, or sometimes even a possibility.