Once adopted, the credit hour became a driving force in higher education. | It presented students with a specific time frame in which they were expected to complete course work, usually one semester…. But Wellman and Ehrlich, a senior scholar with the Carnegie Foundation for the Advancement of Teaching, argue in their book that using time to measure 21st century learning is ineffective. —Steve Geigerich —Academics Make Case to End Credit Hour (AP/Newsday)