A survey instrument for measuring software process maturity is developed and validated. An empirical study of 362 software project managers is used to evaluate the performance of the survey instrument. The survey items factored into two dimensions—manageability and measureability—both of which were statistically reliable. The results also suggest that these dimensions possess convergent validity when compared to two other indicators of process maturity: a survey-based measure of software process customizability and self-reported CMM assessment level. The main implication of the study is that there are reliable and valid ways to measure software process maturity within the constraints of survey-based research designs.