This teacher's guide was developed for the third of four courses in Valencia Community College's Interdisciplinary Studies program, a 2-year core general education curriculum which chronologically examines the major developments in the evolution of human knowledge. The guide provides an introductory overview of the course's topic (i.e., Western intellectual history from 1800 to 1950 traced through the themes of the nature of objective and subjective knowledge); introduces each unit; discusses each topic within each unit, including information on methodology and main points to be stressed; and provides student papers showing the work in each unit. The units of the course are: (1) Determinism and Indeterminism, in which objectivity and subjectivity are examined through the writings, paintings, and music of some of the most famous 19th century figures; (2) Major Theories in Modern Psychology, which is devoted to four founders of modern psychology: Freud, Adler, Jung, and Skinner; (3) A Social Science Research Report, which focuses on analyzing data, reviewing literature, and mastering report writing; (4) Relativity and Its Effects, which explores the discoveries of Albert Einstein, discusses their philosophical implications, and shows that these implications were picked up and interpreted in painting, music, and poetry; and (5) Existentialism, which examines the period from World War I through World War II and looks at existentialism in psychology, philosophy, and film. (AYC)