At the outset, I must confess to being very enthusiastic about the line of research being presented. On a larger scale, I am very pleased to see experimental psychology as conducted by applied cognitive scientists focusing on principles of learning, memory, and cognition that have implications for classroom practice. At the same time, these principles, generally speaking, have been available to classroom teachers in one form or another for some time. The question that I keep asking myself is "what didn't work before, what went wrong?" Why has there been no wide spread adoption of these learning principles by educational professionals?Prior to specific comments about individual contributions, I am going to take the liberty of engaging in some philosophical thoughts. First, I will comment on a couple of metaphors frequently employed by educators when making meaning about educational progress and reform. Second, I will recommend the consideration of "the correspondence principle" as described by Gibson (1994)
Metaphors and ModelsWhen educational psychologists discuss the history of implementing educational practices (innovations?) in the classroom, reference is frequently made to "pendulum swings". This metaphor provides discussants with a visual image meant to portray the changes from one theoretical extreme to another that occur in many curriculum content areas. Another way in which educational psychology has characterized change in educational settings is the use of the biological principle of epigenesis. This principle provides the discussants with an image