Writing Quality Requirements
http://www.processimpact.com/articles/qualreqs.html

Wiegers, Karl E.
Process Impact
2007

Abstract:

This article describes several characteristics of high quality software requirement statements and specifications. We will examine some less-than-perfect requirements from these perspectives and take a stab at rewriting them. I’ve also included some general tips on how to write good requirements. You might want to evaluate your own project’s requirements against these quality criteria.