Another objective in addition to those stated in SO 000 641 was: to develop illustrative source books for teachers and booklets for pupils that exemplify the approaches to be tested in investigations. There were five brief history units written on topics that should be added to textbooks: 1) The Social Impact of the Great Depression, 2) The New Deal, 3) Realism and Idealism in American Foreign Policy, 4) Education for an Urban and Industrial Society, and 5) Why Study History. Five units on intellectual history were written for eleventh grade advanced placement titled "Concepts in American History." Three long history units using a wide variety of literary sources, an experimental course using biographies as an inquiry method, and reading units for slow readers were developed. New materials and strategies such as simulation and problem-solving were developed for teaching history, politics, and economics. One economics project focused on concepts related to production; another involved the writing of supplemental reading materials. Map interpretation was the focus of a geography project. In law, four casebooks were created for the social studies. Lastly, "The Handbook of Social Inquiry" was written to develop understanding and skills in the process of social scientific inquiry. (SBE)