摘要：The role of an educational technologist is difficult to define. This
paper reflects on the experience of working on a range of technology
enhanced learning in science projects to review a number of working
principles which have proved effective in the practice of educational
technology. It discusses how these principles relate to the theories in use in
educational technology. Three case studies are considered illustrating
methods of participatory design, design based research and socio-cultural
approaches. All the case studies are taken from the application of
educational technology principles to the design of examples of science
instruction. The paper offers an interpretation of the contemporary practice
of educational technology.
关键词：Science learning; participatory design; design based research; affordances
