Authors of the taxonomy made various claims about its properties that concern both educational and psychological issues; these claims have stimulated investigations of the taxonomy's validity. As the taxonomy is now entering its twenty-second year, this review attempts to survey these investigations and appraise the findings. (Author/CP)

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…