The document discusses evaluation as both a process and a tool for curriculum development. As a process, evaluation follows procedures based on models and frameworks to achieve desired results. As a tool, evaluation helps teachers and implementers judge the worth and merit of programs, innovations, and curricular changes. The results of evaluation, whether as a process or tool, form the basis for improving the curriculum. The document then examines several evaluation models, including Bradley's effectiveness model and Tyler's objectives-centered model, which provide indicators and processes for evaluating curriculum elements and determining strengths and weaknesses.