This article proposes a model that integrates some of the determinants of scholastic judgment. The model is based on the assumption that a teacher's judgment in a particular discipline is influenced by different variables: the pupil's actual performance in the discipline, his/her actual performance in other disciplines (halo effect), the average performance of the class in the discipline (class context effect), the pupil's individual characteristics such as whether he/she has ever repeated a grade and the teacher's perception of the pupils' causal explanations. Furthermore, the model proposes that a teacher's perceptions are related to the pupil's spontaneous expression of causality, which in turn is influenced by the pupil's knowledge of the social value of causal explanations. In order to test the validity of the proposed model, the authors conducted a study in a real classroom setting on a population of 663 pupils from 38 classes (3rd grade) and their respective teachers. Path analyses showed that the theoretical model fit the data to a satisfactory extent. However, a comparison of the fit indexes of the theoretical model and two alternative models (one nonhierarchical and one hierarchical) showed that the initial theoretical model could be significantly improved by additional paths. (Contains 3 tables, 4 figures, and 3 notes.)