This introduction to a series of articles on the scaffolding metaphor in learning disabilities research introduces each article and raises two main concerns: the lack of careful delineation of how scaffolding becomes operational in research studies and constraints in the use of scaffolding arising from communication problems. (DB)

Responds to commentaries by Bereiter and Gersten concerning findings of the High/Scope Educational Research Foundation's 15-year Preschool Curriculum Comparison Study. Addresses issues of design of study, experimenter bias, sample size, self-report validity, interpretation of findings, and related topics. (NH)