Requirements vs. Solutions
http://www.sprez.com/articles/requirements-solutions.html

Ferlazzo, Ellen Lawson
Sprezzatura Systems
2002

Abstract:

Your requirements will assist you in delivering a software solution that meets your users' needs. You can find all sorts of templates and formal processes for requirements of various kinds, and while they are useful, the biggest problem I've found is that most people confuse defining the need with proposing a solution. As soon as a requirements document contains any part of 'how we're solving this', you've crossed the line into presupposing that you already know what the problem is and can stop listening.