Two experiments examined the reliability and validity of the Cognitive Flexibility Scale. 247 undergraduates in Exp 1 completed the Cognitive Flexibility Scale, the Communication Flexibility Scale, and the Rigidity of Attitudes Regarding Personal Habits Scale. Scores on cognitive flexibility were positively related to communication flexibility and negatively related to rigidity. Scores on communication flexibility were also negatively related to rigidity. Exp 2 tested the scale's concurrent validity. 275 undergraduates completed the Cognitive Flexibility Scale, the Interaction Involvement Scale, the Self-monitoring Scale, and the Unwillingness to Communicate Scale. Results show the Cognitive Flexibility Scale to be internally reliable and supported its construct and concurrent validity. (PsycINFO Database Record (c) 2012 APA, all rights reserved)