The document categorizes knowledge and skills to help with designing learning events. It defines knowledge as information stored like facts, ideas, and procedures. Skill is defined as organized patterns of activity, either mental or physical. There are four categories of knowledge: facts, procedures, concepts, and principles. Facts can be remembered, procedures describe how to do something, concepts are classes of items, and principles explain or predict events. Skills are divided into thinking, acting, reacting, and interacting. Productive skills are innovative while reproductive skills are repetitive. Understanding these categories allows for different training strategies like memorization for facts or explanation and examples for principles.