Many college students today are combining their undergraduate studies with some type of paid employment, volunteer work, or internship experience. Estimates show that more than 60 percent of undergraduate students work in paid positions; as many as 26 percent serve as volunteers; and almost 25 percent of undergraduates participate in internship/cooperative work. This paper, which limits its analysis to undergraduate students, summarizes the data available on working students and then compares them with students who do not work. Also reviewed is the limited research on students involved in community service or volunteer work and in internships or cooperative positions, as well as an analysis of how students balance these activities with their studies. Recommendations are offered for further research. Among the findings are the following: (1) in 1991, 63 percent of all college students were employed while enrolled in school, representing a steady increase over the past few decades; (2) in 1990, 26 percent of undergraduates said they were currently performing community service; and (3) surveys are showing that student volunteers are more likely to be women (36 percent are females versus 27 percent males), and older (41 percent of students aged 30 years old or older volunteer compared with less than 30 percent of students under 30 years of age). (Contains 19 references.) (GLR)