Stage 1. Understand the Situation and Decision
Advice on understanding the situation and decision
Stage 2. Work out What Matters.
Advice on how to work out what matters
Stage 3. Generate Options.
Advice on how to generate options
Stage 4. Assess Options
Advice on how to assess options
Stage 5. Implement Your Decision
Advice on implementing your decision
The Stages In Order
If you don't understand the situation and have a clear idea of the decision you want to make you can hardly start to work out what matters in it. You cannot think up or evaluate options without an idea of what you want to achieve with your decision. And of course you cannot implement a solution until you have selected the best option.
As you are working on later stages your understanding of the situation, the decision you want to make, what matters, or the options you have might change radically. If so there is nothing to stop you iterating back through earlier stages.