Data from NPSAS:93 and NPSAS:2000 are used to compare changes in net tuition and net price over time, after adjusting for inflation. As with The Cost Study, the current study separated public from private not-for-profit colleges and universities and then further separated the public and private 4-year sectors into two aggregated Carnegie classifications: 1) research and doctoral institutions and 2) comprehensive and baccalaureate institutions. The study also analyzed net price changes for public 2-year institutions (also known as community colleges). The analysis excluded students who attended for-profit institutions and other less-than-4-year institutions, as well as those who attended more than one institution. Sample sizes for the excluded institutions in the NPSAS surveys were relatively small and would have yielded few meaningful comparisons. Also, in order to ensure that the amount of tuition¹ paid and the amount of financial aid awarded were comparable between 1992–93 and 1999–2000, only full-time undergraduates attending for the full academic year (i.e., at least 9 months) were included in the analysis. (These students are referred to as "full-time students" throughout the report.) The percentage of students who attended full time, full year ranged from about 50 to 60 percent at 4-year institutions, depending on the institution sector and the NPSAS year, and from 14 to 19 percent at public 2-year colleges.