Useful lifetime of educational materials should be defined by their continuing ability to help meet defined learning objectives. More often lifetime is compromised by changes in the educational environment that do not specifically relate to the capacity of the material to assist learning. Approaches for integration of materials into the learning…

A brief review shows several suggested ways in which cultural historical activity theory has proved valuable to technology supported learning environments. Three of our own design cases are then described (evaluating a peer to peer interface for learning objects, designing an on-line school, and rethinking a public science centre). These are…