At wich step is a solution implemented in the decision-making process of solving a workplace problem?

The decision making process of solving a workplace have seven steps: Identification of the problem, understanding interests, list of possible solutions, evaluating the options, selecting the options, documenting of the agreements and agreeing on contingencies, monitoring and evaluation. The solution is implemented on the last step which is agreeing on contingencies, monitoring and evaluation because in here there are opportunities that are created to evaluate the agreements and the implementation of the solutions.