From the site:
Have a tough decision to make?
Justify can help!
Justify is a web-based application which helps you make rational decisions about big, important topics. Enter your decision points, counterpoints and rationale into Justify, and Justify will help organize and assess those points to help you reach logical conclusions. Justify also allows you to organize and share your rationale with others, helping you justify those decisions with the people who matter most to your cause.
Justify is being developed by Christopher Fry at MIT.