Im an advocate for writing functional specs. Here are 3 reasons why I
believe specs facilitate development of Websites and applications:
1) Specs serve as the blueprint for the developer, which enables them
to review the project and start coding without delay. Would you build
a house without a written plan?
2) Specs that are reviewed/approved by project stakeholders help
ensure that the finished product meets expectations. Isnt it easier
to update a spec than to rewrite lines of code?
3) Specs also serve as the starting point for the development of use
cases, which streamline the QA process. How else are the testers
supposed to know what to expect when a button is pressed, etc.?
I cant think of a good reason not to spec. Can you?