Ebbinghaus's contribution to the measurement of retention: savings during relearning.

The focus here is on Ebbinghaus's sole measure of retention: savings during relearning. The article is divided into four sections: (a) the historical perspective surrounding Ebbinghaus's use of savings and relearning (including a fundamental difference between Ebbinghaus's conception of memory and that of his contemporaries such as William James), (b) potential problems with savings as a measure of retention, (c) recent findings based on savings and relearning, and (d) applications of savings and relearning.