The hierarchical model for the teaching of computer programming to children that is presented in this report comprises five content domains: (1) technical skills of controlling the machine; (2) mastery of the programming language; (3) understanding the structure of a computer program; (4) understanding the logical dynamics of the computer program; and (5) the knowledge required by the topic of the program. This model was used to construct a teaching unit designed for grades 6 to 9, although in many cases parts of it may be taught as early as grade 4. The teaching unit, which is described in some detail, was used in several situations in 1982-84. The results of these studies are briefly reported with preliminary conclusions on the cognitive, affective, and curricular aspects of the unit. A 13-item bibliography is provided. (EW)