Decide and Review
The last phase of collaborative problem solving as a project manager is to decide upon the final solution. Often, the project manager is not responsible for making the decision, but they are responsible for ensuring that a decision is made. This can mean giving each solution a score, or using one of many collaborate decision-making techniques available for facilitators. Whatever the method, the goal is to drive the project team to a final answer.
Once the decision has been made, the project manager has a few more duties. First, collect all the work that was done, the problem statement, the fitness criteria, the candidate solutions, and the final decision and rationale. This all needs to be preserved, so that you know how you go to where you are. It should be prepared in a form that can be reviewed and understood by people outside of the project team, or those on the project team, but who were not involved in the collaborative problem solving session or sessions.
Finally, a few weeks, months or years down the road, you should be prepared to evaluate the decision itself. Was the problem statement accurate? How did the criteria hold up? How about the final solution? Learning how we make decisions makes us better decision-makers in the future.
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