Objective: This paper reviews experience, in both research and application, with measures of appropriateness applied to the utilization of hospital inpatient services in the UK.Background: The evolution of different methods for measuring appropriateness of use and the associated reasons for misutilization are described.Research and Application: Recent research developments and applications are outlined and discussed.Conclusion: Contemporary enthusiasm with Diagnosis Independent Explicit Criteria Utilization Review Instruments is observed and some of the underlying influences are explored.