Data tables and graphs are presented to illustrate patterns of student enrollment at Mercer County Community College for 1976 through 1981. After a summary of study highlights, the report presents general findings concerning: (1) full- and part-time student persistence; (2) full-time students' graduation rates; (3) full- and part-time student non-returning rates after one semester; and (4) patterns of program change after one semester among part-time students for 1978-79 to 1980-81. The data reveal that, overall, the percentage of full-time students who returned the following semester in full-time status showed a 5% decline between Fall 1976 (71%) and Fall 1980 (66%). Simultaneously, the rate of change from full- to part-time status increased from 8% in Fall 1976 to 13% in Fall 1980. Part-time persistence remained relatively stable across all of the semesters studied. The non-returning rate in certificate programs increased dramatically--more than doubling after a 1979 low of 17%. Among non-degree students, the non-returning rate fell sharply from 33% in 1979 to 22% in 1981. Full-time Fall entrants tended to graduate after four semesters, while Spring entrants tended to graduate after five. Part-time students who did not return after one semester tended to be enrolled in non-degree and developmental programs. Rates of program change among part-time students were very small. Tables showing persistence in and mode of leaving full- and part-time status are appended. (AYC)