The document discusses aspects of curriculum design using several models. It introduces Biggs' 3Ps model, which describes the teaching-learning situation as having three stages: presage, process, and product. It then discusses an input-output model of educational systems, noting that in open systems not all components can be fixed. The document concludes by noting that if you want to put students through a standard course but have them come out with capabilities at a set level, you cannot fix all three components of input, process, and output.