This special issue of IJCML is dedicated to our good friend and colleague, Jim Kaput. In many ways, each article was inspired by collaborations that involved Jim; and, they also are examples of some of the most important directions that Kaput’s research was moving at the time of his untimely death. For example, the article by Lehrer, Kim, and Schauble emphasizes ways that expressive media (which may vary from technical languages, to paper-and-pencil notations and sketches, to computer-based tools for communication, collaboration, and conceptualization) shape and empower the ways that people think. The article by Konold, Harradine, and Kazak emphasizes Kaput’s longstanding mission to use technology to provide all children with democratic access to powerful ideas; and, the article by Lesh, Caylor, and Gupta emphasizes the infrastructural nature of the preceding kinds of conceptual tools. That is, the conceptual tools that humans develop to make sense of their experiences typically have both expanding and constraining influences on thinking; and, the same conceptual tools that have been developed to describe and explain existing situations also tend to be used to create new systems, artifacts, and tools. So, as soon as people develop better ways of thinking about things that currently exist, they tend to change these things in ways that make the development of conceptual systems a neverending enterprise. Furthermore, this is especially true in a technology-based age of information. It is well known that Kaput was a futurist who had a deep interest in history. Consequently, when we, like he, investigate how concepts develop in the thinking of students, our research is informed not only by information about how relevant concepts develop logically, psychologically, and pedagogically—but also historically. Yet, a fact that is not as well known about Kaput is that he was once a literature major who especially loved Don Quixote. So, it is not surprising to hear that many people considered him to be a ‘‘knight for the right.’’ For example, his mission was to use the best available technologies to go
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