The increased public focus on community colleges makes this a time for policy makers and others to gain a better understanding of the demographics of the institutions, according to a brief  released Tuesday by the American Association of Community Colleges. Many assumptions that people have about college enrollment generally, or about community colleges, are out of date, the brief argues. For instance, many people assume fall enrollment figures are a good indication of total enrollment. But at community colleges, unduplicated year-round enrollments are on average 56 percent higher than fall enrollments. Including non-credit students would further add to the total.