The objective of the research reported here was to develop a way of scoring university instructors' performance that covered all of their major tasks and reflected quality as well as quantity. Following a literature review and interviews with senior academic staff from two very different Thai universities, 35 subtasks, grouped under six principal tasks, were proposed. Additional samples of senior and experienced staff were consulted to determine the weight each task and subtask should contribute to instructor performance scores at each university. Data was collected for 3 years for a total of 290 instructors from both universities. Performance scores were reliable and the relationship between subtasks and total score was stable across the years within each university. Heads of department considered the scores to be valid measures of 90% of the instructors in their departments.