Patterns od Data Sequence Synchrony and Constraint in Cognitive Development The Missing Links Stages in Children s Progression from Sensorimotor Logical Thought The Development of Social Roles A Sequence of Socia-Cognitive Development The Significance of Developmental Sequences for Investigating the What and How of Development The3 Relation Between Developmental Level and Spontaneous Behavior The Importance of Sampling Contexts Erros and the Assessment of Cognitive Development Explaining the Oedipus Conflict On the Current and Potential Scope of Generative Theories of Cognitive Development