ABSTRACT
Where do problems come from, and what do we do with them once we have them? The impression we get in much of schooling is that they come from textbooks or from teachers, and that the obvious task of the student is to solve them. Schematically, we have the following model: https://s3-euw1-ap-pe-df-pch-content-public-p.s3.eu-west-1.amazonaws.com/9780203052266/b41fefe2-91da-46ef-9fb5-2e32f6c6964e/content/ufig1_1_B.tif" xmlns:xlink="https://www.w3.org/1999/xlink"/>
