ABSTRACT
Every computer language has a set of primitive (built-in) objects. These can be classified into two sets: the set of procedures, or things that the language knows how to do, and the set of data types, or the types of things the language knows how to do things to. These two sets are tightly interrelated, since it is difficult to describe an action in a way that is completely independent from what is being acted on. This chapter presents some of the primitive Logo objects and the actions that operate on them.
