The AP technique can be saved and recalled later. The set of goals in the technique is typically (but not necessarily) accompanied by a previously established beam arrangement class solution, which is automatically applied when the technique is recalled. The process of AP commissioning consists largely of designing, by trial and error, of the technique(s) that produce desired outcome for a class of cases with similar clinical goals. While theoretically not requiring prior knowledge, the technique evaluation process is clearly influenced by the operator's perceptions of what a good plan should look like, and by the prior experience with similar plans.