In order to discover the differences between information processing and education, it is necessary to define a few terms. These terms must capture the most important qualitative differences between, say, information and knowledge.
In this paper, I identify five types of ``entropic items,'' namely entropy, information, doctrine, knowledge, and wisdom. These concepts form a hierarchy: wisdom is a refinement of knowledge, knowledge is a refinement of doctrine, doctrine is a refinement of information which in turn is a refinement of entropy. In this section, I define these terms in order, starting from the lowest (most general) category, entropy.