“The Situation with respect to the Spacing of Repetitions and Memory”, 1970-10 (; backlinks):
The revival of interest in the effectiveness of spaced practice, as compared with massed practice, in learning is attributed to the abandonment of the constraints of serial and paired-associate list learning and the discovery of stable benefits from spaced practice in continuous paired-associate learning, short-term memory for individual items, and single-trial free-recall learning.
Comments are made about the preceding symposium papers by Underwood, Waugh, and Greeno, and some data on the differential effects of spacing of repetitions in free-recall learning are introduced in an effort to assess the current state of fact and theory.