In one of the earlier essays in this department, we discussed a number of acronyms all having to do with system design, and all having the form "x-centered design." The purpose of that essay was to demonstrate a broad framework within which to understand human-centered computing (HCC), and also to show the various convergences and divergences of the communities of practice that have introduced their own x-centered-design designations. Among them are learner-centered design, client-centered design, designer-centered design, decision-centered design, and work-oriented design.