This was my doctoral dissertation in computer science at the University of Colorado. It was entitled: -Interpretation in Design: The Problem of Tacit and Explicit Understanding in Computer Support of Cooperative Design- and was defended on August 5, 1993. The dissertation explored the implications of the theory of tacit knowledge for the problem of computer capture of design rationale. It discussed a software system for design by teams of NASA designers. The computer environment captured design ideas in a flexible system of professional perspectives. This research led to explorations after...

Here is a diverse collection of writings, starting with my undergraduate thesis on Nietzsche. As an undergraduate, I realized that I did not know how to write and I began by experimenting with assembling quotes from the materials I was discussing. After studying German philosophy from Hegel and Marx to Heidegger and Adorno, my writing became excessively complex, trying to capture German syntax in English sentences. Then, during my community organizing days, I learned to write more clearly. This volume reflects those stylistic changes as well as playing with some ideas that are later woven...

The idea of personalizable software is fashionable today. I explored it in a number of software prototypes a decade or two earlier. The perspectives mechanism in Hermes, my dissertation software system, was an initial major initiative in this direction. WebNet was a follow-up system to integrate the perspective mechanism into discussion-forum collaboration software. Subsequent systems explored personalization mechanisms in systems for work and for learning, including TCA for teachers developing and sharing curriculum and systems for automated critics in design systems or reviewers of journal...

These essays are some of the most important papers co-written with my colleagues that supplement the discussion of CSCL research in the published books. These chapters take the discussion in specific directions. They begin with my general reflections on the importance of CSCL as a research field, situating my work on the VMT Project and my theory of group cognition within the field of CSCL. They describe the VMT research project, including its research approach, technology, pedagogy and analysis methods. Mostly, they discuss in some detail the findings that have emerged from the VMT Project...

Math games and workbooks with topics for online small groups of teachers or students to collaboratively learn dynamic geometry. The approach is based on -Translating Euclid.- The many GeoGebra files used in VMT courses are pictured in the workbook. Several versions of the workbooks are available, including the version used in WinterFest 2013 and analyzed in -Translating Euclid- and -Constructing Dynamic Triangles Together.- Also includes the content of a game version that is available as a GeoGebraBook.