Today a college degree is considered the ticket to a good job and the gateway to economic advancement. A student's chances of gaining admission to college, however, are often based more on parental wealth than the student's achievements. At the nation's most selective colleges, three percent of incoming freshmen come from families in the bottom income quartile, while 72 percent come from families in the wealthiest quartile. To close the gap, some colleges have demonstrated a strong institutional commitment to increasing socioeconomic diversity on their campuses and are working to remove the remaining barriers that block high-achieving, low-income students from enrolling. This report summarizes these institutions' best practices and provide insight into how selective colleges can expand opportunities for outstanding low-income students. [For the executive summary, see ED589030.]