In the 1st of 2 studies, 52 undergraduates were required to judge the appropriateness of 15 behaviors in each of 15 situations in a behavior-situation matrix. Differences among behaviors, situations, and Behavior * Situation interactions contributed substantial proportions of the total variance in judgments. The concepts of behavioral appropriateness and situational constraint were offered to account for the differences obtained among behaviors and situations, respectively. A 2nd study, using a new sample of 42 Ss and different methods of measurement, provided initial construct validity evidence for the concepts. Implications of these results for the construction of situational response hierarchies, the development of behavior and situation taxonomies, and causal attribution are discussed. (35 ref) (PsycINFO Database Record (c) 2016 APA, all rights reserved)