In 1985 the Media Lab was created at MIT to advance the idea that computation would give rise to a new science of expressive media. Within the media lab, the Epistemology and Learning group extends the traditional definition of media by treating as expressive media materials with which children play and learn. The Group's work follows a paradigm for learning research called Constructionism. Several of the chapters directly address the theoretical formulation of Constructionism, and others describe experimental studies which enrich and confirm different aspects of the idea. Thus this volume can be taken as the most extensive and definitive statement to date of this approach to media and education research and practice. This book is structured around four major themes: learning through designing and programming; epistemological styles in constructionist learning, children and cybernetics; and video as a research tool for exploring and documenting constructionist environments.