When designing educational resources, it is important to have a clear understanding of the instructional problem you are attempting to solve, both in terms of its appropriate domain and level. While the cognitive, affective, and psychomotor domains are not mutually exclusive, one will usually predominate. In determining the appropriate level, it is important to remember that to reach a given level it is necessary to pass through all subordinate levels. Levels are: (1) definitions, (2) component recognition and location, (3) awareness of purpose, (4) components of usage, (5) awareness of sequences, (6) application, and (7) discrimination and extrapolation. (STS)