When it comes to assessing the outcome of an action or a project, there are several different synonyms for the phrase 'evaluate results'. One such phrase is 'measure success', which indicates that you are looking at whether or not the initiative achieved its goals. Another option might be 'analyze the outcome', which conveys the idea of breaking down the results into their constituent parts to understand them better. Alternatively, you could 'assess the effectiveness', which implies a judgment of how well the action accomplished what it set out to do. Ultimately, the exact phrasing you choose will depend on the context and purpose of the evaluation.