http://en.wikipedia.org/wiki/Requirements_analysis
McConnell, Steve (1996). Rapid Development: Taming Wild Software Schedules (1st ed.). Redmond, WA: Microsoft Press. ISBN 1-55615-900-5.
Wiegers, Karl E. (2003). Software Requirements 2: Practical techniques for gathering and managing requirements throughout the product development cycle (2nd ed.). Redmond: Microsoft Press. ISBN 0-7356-1879-8.
http://www.swebok.org/stoneman/version_0.5/Breakdown_of_Software_Requirements_Analysis(version_0_5).pdf
http://www.cs.toronto.edu/~sme/CSC444F/slides/L14-RequirementsAnalysis.pdf