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According to the Aspen Institute College Excellence Program, credit hour accumulation, also referred to as "credit intensity" is defined as the average number of credits earned by all students enrolled in a single semester (or quarter) and across each 12-month period. Colleges may set thresholds for credit hour completion milestones and assess the percentage and number of students that meet them in specific timeframes (e.g., percentage of students successfully completing 15 credit hours in the first term, 30 credit hours in the first year, and 45 credit hours by the end of the third term).