This set of 13 research reports, bulletins and papers is a product of the Mathemagenic Activities Program (MAP) for early childhood education of the University of Georgia Follow Through Program. Based on Piagetian theory, the MAP provides sequentially structured sets of curriculum materials and processes that are designed to continually challenge children in kindergarten through third grade from low income families to learn about the physical and social environments. Materials collected here focus on topics related to cognitive and language development. Titles included in the set are: (1) The Use of Mathematical Models for Describing Sequential Search Strategies in Elementary School Children; (2) Measures of Language Comprehension: Relations to Performance; (3) Models for Performance in Syllogistic Reasoning; (4) An Analysis of Organizational Structure by Application of Individual Differences Multidimensional Scaling; (5) Development of Concrete Operations in Urban and Rural Communities: A Study of the Effect of the Mathemagenic Activities Program; (6) A Survey of Cognitive Abilities of Children in Different School Programs; (7) Lifeways and Cognitive Performance in Australia and the United States; (8) Development of Social Relations: Role-Taking Skills and Classification Abilities; (9) The Concepts of Appearance, Disappearance, and Reappearance: A Developmental Semantic Analysis; (10) Analysis of Error Choices on the Ravens Progressive Matrices; (11) Growth of Logical Thought in Rural and Urban Environments; (12) Role-Taking and Egocentricisms; and (13) Children's Conception of Reality: Some Implications for Education. Prefatory or introductory material in each report indicates the focus and purposes of the work. (RH)