“Manipulate Important Educational Variables”, 1980 (; backlinks; similar):
For 9 years personnel of the Study of Mathematically Precocious Youth (SMPY) at Johns Hopkins have found thousands of youths, chiefly 7th-graders, who reason extremely well mathematically. SMPY strives in various ways to help these students proceed considerably faster and better in mathematics and related subjects than is usually permitted or encouraged. Its work is offered as an example of important problems that, in the judgment of the author, educational psychologists should attack vigorously.
SMPY’s 4-D model is described, which emphasizes educational acceleration of youths who are highly able and eager to move ahead quickly.