The theoretical model upon which acceptance and commitment therapy (ACT) [1] is based holds that six distinct, but interrelated processes, contribute to psychological flexibility. The psychometric properties of a self-report measure designed to assess self-as-context, one of these six core processes, was evaluated by administering it to several college student samples. The scale displays adequate internal consistency; divergent validity, with sufficiently low correlations with measures of religiosity, neuroticism, and social desirability; and convergent validity in being significantly related to psychological flexibility, satisfaction with life, and a widely-used measure of spirituality. In addition, the scale is a significant predictor of life satisfaction over and above psychological flexibility and religiosity.