INFORMATION ENGINEERING IMPLEMENTATION ISSUES: AN INFORMATION SYSTEMS MANAGER'S PERSPECTIVE For many purposes, however, one need not know why it is that schools with advantaged students outscore those with disadvantaged students; the fact that they do is itself of substantial importance. This dissertation focuses on two such topics: The competitive impacts of school choice programs, and the design of college admissions rules. In each case, when I incorporate into the standard analysis the key fact that student composition may function as a signal of student performance (and vice versa),.