Since their concern is about retention of course degree material, which ostensibly we're spending 4 years and many thousands of dollars learning because it'll b

Since their concern is about retention of course degree material, which ostensibly we're spending 4 years and many thousands of dollars learning because it'll be so useful in our careers, the long-term forgetting curve may look different if career demands create repeated rehearsals of learned material. You might forget a bunch of material from your compilers course, but the rest of it becomes periodically useful in your web dev career and the total loss flattens out. Then testing you on the trivia shortly after your compilers course will paint a misleadingly pessimistic picture. This is why they spend all that space wondering about how rehearsal affects connected concepts - how specifically do any of these concepts have to be rehearsed before it counts as a refresh for the spacing effect? Do even vaguely related career demands suffice to draw on and preserve other course material?