An instructional change model, known as OSSI (Organizing for Social Science Improvement) which helps small rural school administrators and teachers learn about, respond to, and effectively adapt new ideas to local instructional settings, is described. The OSSI project was begun in 1979, when 29 districts in east Texas had documented student and program needs in social studies, citizenship, free enterprise, and career education but lacked resources to undertake the development of a K-12 social studies/citizenship curriculum. The resources that they pulled together comprise this publication, of which there are many parts. The bulk of the publication contains the instructional management system (IMS) developed to encourage curriculum coordination across the 12 grades. Ten core concepts are identified. A K-12 scope and sequence indicating subjects and objectives for each grade level are provided. Instructional materials and learning activities are coded to each objective. Mastery tests are provided. Other resources contained in the publication include a list of teacher competencies, a resource bibliography, a needs assessment and evaluation guide, and a discussion of change models. (RM)