This paper considers the reliability of a much referenced measure of identity, Constantinople's Inventory of Personality Development. Al- though Constantinople indicated only moderate acceptability of the reliability of the instrument, a review of literature indicates that later researchers utilizing the measure generally did not report independent reliability estimates. This paper reports reliability estimates, computed for the identity subscales with a sample of undergraduate students, which suggests caution in the use of this measure for identity research. Discussion includes the implications of this methodological issue for future identity research.
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