I speak with Mary and Ellen about their book Discover to Deliver.  Creating a Structured Conversation about the discovery process.  If you want to build the right thing you need to get people together and explore the space, find the value and find a way to confirm.
They evaluate the dimensions of features along the following dimensions:

User
Action
Data  
Control
Interface
Environment
Quality


I love the fact that they went for a visual management, lean startup and agile delivery to pull this book together.  
Take a look here http://www.discovertodeliver.com/voices.php
-Enjoy