The Interdisciplinary Assessment Model was created out of the need for improved assessment of learning, especially the assessment of critical thinking and problem solving. Development of the model required establishing a common language for library media specialists to cover various curriculum areas, a comparison of current state standards for subject areas, and creation of rubrics for each stage of the assessment model. The model is based on the "Big Six" model for information problem-solving by Eisenberg and Berkowitz and is derived from an analysis of Kansas content standards for language arts, social studies, mathematics, science, reading, and library media. The model divides student assignments in these six subject areas into five parts, using terminology from the standards for each subject. Rubrics were developed for each of the five parts of an assignment. This paper describes the development of the model, elements of the model, preliminary findings of the current research project which tests the model, and implications for implementing the model in schools. The model facilitated student learning in all grade levels studied and for units of any length. The integrated assessment model is an effective and efficient planning and teaching tool for library media specialists and teachers. Effective implementation requires instruction and tools which will enable teachers to change their instructional strategies to more effectively engage the student learner and to provide feedback to the learner. (Author/SWC)