Specification & Design

Everything starts with this. But if it is not understood well, the clean coding is worth for nothing.

Specification

• Specification must be clear, complete and consistent

• Specification must be well understood by the developers

• Avoid implementing a poorly specified features - they will ruin the code

Design

Do not underdesign

• The design should be a correct and complete solution for the given problem

• Draw examples to see every possible cases and to find the good solution

Do not overdesign

• Do not design for assumptions

• Do not design solutions which will be used much later - "They will be good in the future"

• YAGNI - You Ain't Gonna Need It