A major revision of the original work, this volume examines all of the basic methodological issues involved in measuring behavior, designing comparisons of control and experimental conditions, and interpreting behavioral data. It emphasizes methods of direct measurement, within subject designs, and graphical analytical tactics. Stressing the unique methodological requirements of behavior as a subject matter, it avoids a cookbook approach by examining methodological strategies and tactics in terms of their influence on the researcher's behavior. Written as a text for use in both undergraduate and graduate courses, this volume contains a number of features that aid student mastery, including detailed chapter outlines, boxes explaining supplementary or specialized material, study guides for both text and boxes, and a glossary of terms.