Those of us in the business of psychological measurement use the terms reliability and validity a lot. You've probably seen those terms on the Psychology Today website (they appear thousands of times) ...

How to use specific type codes to categorize work orders. How to implement real-time status codes to monitor work order progress. How to differentiate between repair downtime and scheduled downtime.

The measurement of joint range of motion (ROM) is a cornerstone of clinical assessment, rehabilitation and biomechanical research. Reliable and accurate quantification of joint movement is essential ...