These additional levels of learning are the basis of the knowledge, attitude, and skill learning objectives commonly used in advanced  qualification programs for airline training. They also can be tied to the ACS to show the level of knowledge or skill required for a  particular task. A list of action verbs for the three domains shows appropriate behavioral objectives at each level.  [Figure 3-13]  Instructors who are familiar with curriculum development recognize that the action verbs are examples of performance-based  objectives.  3-18  Figure 3-13.  A listing such as the one shown here is useful for development of almost any training program. 