A group of students normally distributed in aptitude and given the same instruction will produce a normal distribution of student achievement. It has been contended that if each of five primary variables in learning are optimized for each student, all students should be expected to achieve mastery of the material. These variables are (1) aptitude…

An attempt was made to determine what factors relate to achievement in language arts, mathematics, and certain attitudes in an individualized programmed instruction school. A total of 87 fifth grade pupils were tested both in the Fall and Spring using the Commonwealth of Pennsylvania's Pennsylvania Questionnaire and the Stanford Achievement Test.…