We use a time-based system to help organize, summarize, and analyze research on employee absenteeism published in the last 20 years (1977)(1978)(1979)(1980)(1981)(1982)(1983)(1984)(1985)(1986)(1987)(1988)(1989)(1990)(1991)(1992)(1993)(1994)(1995)(1996). Although what is known about some mid-term (4-12 month) origins of absence-taking has been greatly clarified and expanded, less is known about long-term (> 12 months) and short-term (I day -3 months) origins, or about how causes in different time frames relate to each other. Poor performance and "neglectful" behaviors serve as reliable offshoots of absenteeism. The long-and short-term etiology of the latter behaviors is unclear, but their shared variance in the mid-term reflects negative job attitudes. Outcomes of absenteeism have received much less research attention. Although mid-term consequences such as reduced performance, turnover, and organizational expense are well-established, little is known about short-and long-term effects of absence-taking on individuals and their social environments. We conclude with suggestions for more explicit consideration of time frames, causal lags, and aggregation periods in the next decades of absenteeism research.