Theories about adult development have been grouped into four models: biological, psychological, sociocultural, and integrative. Biological models (those that are concerned with how physical changes affect development) and psychological models (those that view development as either sequential--defined by life events-- or as a series of transitions…

The terms "learning communities" and "communities of practice" are being used with increasing frequency to describe the phenomenon of groups (communities) of individuals learning together. Theories focusing on the social nature of cognition and meaning, as opposed to those focusing on individual learning, are stressed. In works…