Another source for contrasting paradigms is Altman, I., & Rogoff, B.
(1987). World views in psychology: Trait, interactional, organismic, and
transactional perspectives. In D. Stokols & I. Atlman (Eds) Handbook of
environmental psychology (Vol 1) NY: Wiley. They rename contextualism as
transactional (following Dewey) and build upon Pepper.
Another more recent and very interesting comparison of approaches to
context (including CHAT) can be found in van Oers (1998). From context to
contextualizing. Learning and Instruction, 8 (6), 473-488.
Ellice Forman
Dept of Psychology in Education
University of Pittsburgh