Joel on Software has a great article on why you should bother writing a functional
specification:

“I believe that on any non-trivial project (more than about 1 week of coding or more than 1 programmer), if you don’t have a spec, you will always spend more time and create lower quality code. Here’s why.

The most important function of a spec is to design the program. Even if you are working on code all by yourself, and you write a spec solely for your own benefit, the act of writing the spec — describing how the program works in minute detail — will force you to actually design the program.“

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