As part of a 5-year follow-up of students who transferred from Illinois 2-year colleges to Illinois senior institutions in fall 1979, a study was conducted to analyze the persistence and achievement rates of 10,016 students during their first year after transfer. The study revealed that: (1) the spring 1980 term was completed by 83% of the Associate in Arts/Associate in Science (AA/AS) students, 73% of the Associate in Applied Science (AAS) graduates, and 77% of the students without a degree; (2) the overall attrition rate after 1 year was 21%; (3) AA/AS degree students earned an average of 62.9 credits at the 2-year college and had an average of 61.4 credits accepted by the senior college, while for AAS students these figures were 68.6 and 56.0, respectively, and for students without a degree, the figures were 38.3 and 43.2, respectively, indicating that non-degreed students attended more than one institution before transferring; (4) AA/AS students earned slightly more credits than non-degreed students at the senior college, with AAS graduates earning the lowest average credits; (5) for all three groups, grade point averages (GPAs) declined in the first term after transfer and rose in the second term, though not to pre-transfer levels; and (7) a higher proportion of students with low grades appeared to discontinue enrollment. The study report compares findings with previous studies conducted in 1967 and 1974 and discusses the study's implications for 2-year college education in Illinois. (HB)