Since the work was produced by higher education, the words tend to be a little bigger than we normally use. Domains can be thought of as categories. Instructional designers, trainers, and educators often refer to these three categories as KSA (Knowledge, Skills, Attitude or Abilities). This taxonomy of learning behaviors may be thought of as “the goals of the learning process.” That is, after a learning episode, the learner should have acquired a new skill, knowledge, and/or attitude.