To test the relationship between levels of participation and organizational effectiveness, 166 secondary school teachers completed Likert's "Profile of an Organization" and an adaptation of Belasco-Alutto's""Decisional Participation Scale." It was assumed that Equilibrium (participating as much as desired) was the most satisfying state. Saturation (participating more than desired) was next, and Deprivation (less participation than desired) was least satisfying. This continuum of "Decisional-Deviation" correlated with perceived organizational effectiveness at .21 (significant at .001). The "Decisional-Deviation" modification indicates that over-participation as well as the more frequent decisional deprivation both detract from teacher satisfaction. (Author)