Traditional scale construction procedures were used to develop an 11-item scale to measure psychological maturity. Preliminary results from two independent samples suggest an internally consistent scale when completed by managers, peers, and by self-report. Manager and peer ratings were significantly correlated, suggesting convergent validity between "objective" raters. Manager and peer ratings were also both significantly correlated with a performance measure. Findings suggest the scale warrants additional examination in other samples and settings. Variables that might show relationships with psychological maturity are suggested.
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