This report contains abstracts of 20 selected research studies related to individuals working as a group to achieve a goal. Each abstract consists of these components: author(s) or researcher(s); title; source (journal citation); purpose of the research; participants; method; results; and discussion. In general, the studies show that working in groups can improve the performance of individuals and the group. The report is intended to help guide human resource development professionals in their efforts to design more productive work systems. (YLB)