Based on an MA thesis submitted by the senior author to Northwestern University, 1966.

The escalation of commitment has been variously labeled the psychology of entrapment, the sunk cost effect, and the too-much-invested-to-quit syndrome. This article reviews the state of research and describes four major determinants: project; psychological; social; and organizational variables. A model is provided. (YP)

Written by a biologist, this paper is intended to present information on the sociological study of man from a biological perspective. Perspectives include that (1) sociology neglects biological variables that are part of understanding human behavior and human societies; (2) the sociobiological or evolutionary view of human development is…

Maintains that (1) research questions must address intra- and extraorganism contextual relations and must be multidisciplinary in scope; (2) research must be sensitive to contextual variability and individual differences; and (3) scholars must develop empirically generative models linking the development of human beings with changing contexts. (BC)

A 5-week study was conducted to examine the acquainting process--changes that occur as a relationship between two strangers develops. Fifty subjects were paired in same sex dyads and were asked to talk to one another once a week for half-hour periods. The unstructured conversations were tape-recorded and questionnaires were administered to the…

Extending the work of behavioral scientist Urie Bronfenbrenner on the social and contextual factors influencing human development, this collection of essays, from scholars in a range of disciplines, shows how Bronfenbrenner's ecological theory and research have transformed the way many social and behavioral scientists approach, think about, and…

Human development from about ages 2 to 5 is presented in terms of the history of a child conceptualized in terms of stimulus and response functions and his interactions in current situations which consist of organismic, physical, and social conditions. The concepts describing the changes that occur during this developmental period, such as…

Research into teacher nonverbal behavior is needed. Although teachers are usually aware of their verbal behavior, they may be unaware of many nonverbal cues they express through gesture, facial expression, posture, vocal tone, or similar mechanisms. Such nonverbal expressions convey attitudes and impressions which may affect the teaching-learning…