ABSTRACT
The way a product or service is used and integrated into a system is often dictated by the constraints imposed in the design process. These constraints may be a result of technical limitations, cost, legal concerns, or imposed by the manufacturers to maximize future profits. This chapter uses an ecological design technique based on cognitive work analysis (CWA; Rasmussen, Pejtersen, and Goodstein 1994; Vicente 1999; Jenkins et al. 2009) to capture the constraints of the iPod and the domain in which it interacts. This constraint-based approach allows us to consider some of the constraints imposed on the product and the impact of removing them.
