The objective of this research project was to develop a validated scale to measure Level 5 Leadership using the Collins () Level 5 attributes. An expert panel reduced the 99 attributes from Collins to 74. The 349 participants evaluated their bosses on a 10‐point semantic differential scale for each attribute. A review of the literature suggested that Level 5 leadership and servant leadership represent the same concept; thus the study used a 10‐item servant leadership scale to check for concurrent validity. Additionally, Collins proposed eight untested questions to determine if individuals qualify as Level 5 leaders. Principal component analysis resulted in two factors that explained 55.2% of the variance; these factors matched Collins's proposed personal humility and professional will constructs. The final instrument contains five attributes of personal humility and five attributes of professional will that yield Cronbach alphas of .83 and .83, respectively. The analysis also revealed statistically significant positive relationships between the Level 5 attributes, servant leadership, and a single factor that represented Collins's eight questions.

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