The purpose of this study was to develop and compare task difficulty measures for nurses and medical service corpsmen. This is one of a series of reports concerning the role of the nurse and medical service corpsman in the Air Force's health care delivery system. A sample of 135 nurses and 133 medical service corpsmen completed difficulty ratings on tasks included in previously administered job inventories. The reliability of the ratings was analyzed and correlation between the two groups of ratings evaluated. The correlation between the two groups was extremely high, suggesting that direct comparisons between difficulty of jobs performed by medical service corpsmen and nurses could be made without fear of bias as a function of raters. (Author)