This report gives an answer to the question "What motivates summer session attendance?" The patterns of attendance of 3 groups of students (summer session only, academic year only, and both) are compared with the "ideal," and the generalization is made that the academic year students attending the summer session are "more often motivated by acceleration toward the degree goal" than the "academic year only" or "summer session only" students. "Ideal" is defined as attendance at both parts of the summer session or throughout the academic year terms (fall, winter, and spring). Attendance data are given for each group of students in the College of Liberal Arts, the College of Education, and the Graduate School for the academic years 1963-64 through 1967-68 and the summer sessions 1964-68. (DS)