Four projects, conducted as part of an ongoing programmatic research effort to develop and evaluate curricular modules for Head Start classes, are presented. Project A was an attempt to identify the effectiveness of an intervention approach that involved the introduction into two classes of curricula in language, mathematics, motivation, and parent involvement. The analysis of the combined curriculum effects on motivation suggested that the procedures used to evaluate the results may need to be supplemented in future intervention attempts by a more precise and more curriculum-related approach. The specific purpose of Project B was to introduce the motivation curriculum into three classes and to provide evidence for its further and more comprehensive refinement. An evaluation of the direct effects of the curriculum on motivational variables again suggested the advisability of supplementing future evaluations with a more exacting and curriculum-related approach. In Project C, an experimental version of a music curriculum for Head Start children was introduced into two classes by itself and into two classes in combination with a physical activities curriculum. An experimental test of music achievement did not reflect the effects of the curriculum relative to a control group. Project D consisted of the development and presentation of an experimental physical activities curriculum by itself in two classes and with the music curriculum. Results were inconclusive. (Author/CK)