Evaluation, analysis and synthesis are general cognitive skills, necessary for planning tasks, and are therefore involved in efficient performance of any productive skill. This is the ability to act on the decisions taken. Analysis of a problem often results in the formulation of a plan, which is, however, not put into action because of some other inhibiting factor. Once initiated, the actions required to perform the skilled activity may come to a premature halt, because of fatigue, boredom, growing opposition from other people, or some other negative factor. Continuation enables us to overcome these factors and to see the task through.
Control closes the cycle.
It is the ability to monitor the results of one's actions and correct any errors or shortcomings. This ability closes the cycle in the sense that it depends on constant attention to the progress of the task in hand, perceptual acuity and discrimination to identify potential difficulties as they arise, interpretation of the reasons for the difficulty, etc to recall of other relevant knowledge, further planning and, perhaps, re-initiation of the action. These 12 abilities may not be the only ones that influence the performance of a specific skill. However, they are the most commonly encountered ones, being present in all types of skilled activity, whether psychomotor, cognitive, reactive or interactive. Not all of the 12 factors are of equal weight in each case and the abilities of analysis, synthesis and evaluation are not relevant to the majority of reproductive skills.