This study uses original survey and archival data from factory and office employees in one firm to relate differences among individual employees' performance to differences in their skill and attitudes about work, and to test the association between employees' earnings and their performance, skill, and attitudes. We suggest that the way in which skill and attitudes affect performance will depend on the type of work that is done. The main results show that among factory employees, those who have on‐the‐job training and longer experience receive better performance ratings than those without training and with less experience. Factory employees' earnings depend on their performance, following the human capital model of wage determination. Among office workers, training and experience do not significantly affect performance ratings; instead, higher‐rated employees have more positive attitudes about work. Office employees' earnings depend on their classroom training, experience, and attitudes, but not on their rated performance.