Development of the State Impostor Phenomenon Scale

The purpose of this study was to develop a State Impostor Phenomenon Scale (SIPS). Participants (344 graduate and undergraduate students) were asked to complete the SIPS, the State Self-Esteem Scale, and the State-Trait Anxiety Scale in three situations, followed by the Trait Self-Esteem Scale. Results showed that the SIPS had stable factor structure, and adequate reliability. In addition, the predicted correlational patterns among the scales demonstrated the construct validity of the SIPS. Moreover, the SIPS was responsive to different situations, as evidenced by significant differences between the scores in the three situations.