In this study, a measure of Lean management was developed and tested. Items were identifiedusing the Delphi technique with literature review and expert responses. Twenty-five nurses pilot-tested the instrument and then 212 nurses in 5 hospitals completed the instrument, and theirresponses were subjected to exploratory factor analysis. The 75-item instrument includes 12 factorsdescribing Lean management conceptualization. Reliability and validity are acceptable for a newinstrument. Key words: instrument development, Lean management, process improvement,quality improvement, quality manage