When the University of California at Berkeley initiated year-round operation in the summer of 1967, the prevailing question concerned whether such a system would work. Midway through the summer term of the following year, a mail survey of 2,100 students --a 25% sample of those enrolled in the 1968 Summer Quarter-- was conducted to evaluate the program and to assess student reactions to it. In order to establish whether the sample group differed from the total summer student population and from students who attended other terms during the year, a comparison was made of survey data and information gathered from the total student population through regular registration procedures. Of particular interest were any distinguishing characteristics of summer quarter students, their opinions of and reasons for attending the summer session, and patterns of their attendance. Since their reasons for attending would facilitate the tailoring of the program to their needs, a large portion of the questionnaire was devoted to this topic. The findings presented in this report are based on responses from 1,428 students. They analyze the students' characteristics, their patterns of attendance, the reasons why they chose to attend the summer quarter, and their reactions to the summer program. The survey questionnaire and 36 tables are included. (WM)