A cursory investigation of education-related professional literature that has ap peared in the last five years indicates increasing emphasis upon the application of behavior principles in home and classroom environments. Behavior principles ( Skin ner, 1953) are used to analyze, in a functional manner, the frequency of behavior that is directly observable and measurable, and those environmental events that oc cur immediately bef o re and after behavior. Environmental events affect and de termine the occurences of behavior at a specific time, place, and set of conditions (Whelan and Gallagher, 1969 ), and usually function to increase or decrease spe cific behavior frequency. Behavior principles, theref o re, refer to the connective . .. relationship between behavior and environmental events ( Skinner, 1963).Educationally relevant applications of behavior principles in classrooms for chil dren with academic performance, and nonacademic madadaptive behavior patterns, have been described in other sources. Studies and reports pertaining to Engineered Classrooms ( Hewett, 1968) and the Structured Approach ( Gallagher, 1968; Har ing and Phillips, 1962; Whelan, 1966) represent examples of procedures used in applying behavior principles in classrooms and other child-related environments. A comprehensive description ·of these procedures is provided in the sources cited and should be reviewed, since the information provided in this article is, by necessity, somewhat limited in scope. The intent and focus of this article are to present some of the recent extensions and elaborations of the Structured Approach through the more systematic application of behavior principles associated with that concept. Some of the basic rationale relevant to the Structured Approach are stipulated to provide a general perspective. The importance of providing systematic procedures for application of behavior principles to help children increase appropriate behavior and decrease self-debilitating behavior, plus the necessity of evaluating procedure effectiveness, is described and stressed.The Structured Approach and recent developments in the application of behavior principles have received considerable attention during the past decade. It is not difficult to ascertain the reason for such continuing attention and interest. It is due