1. Preparation –  a proceeding, measure, or provision by which one prepares for something: preparations for a journey.

2. Plan – a scheme or method of acting, doing, proceeding, making, etc., developed in advance: battle plans.

3. Perform – to carry out; execute; do: to perform miracles.

4. Perfect – to bring nearer to perfection; improve; make better: She works hard to perfect her writing. 

The problem solving process is cyclic, as there will always arise new problems and new solutions to tacke those.