Background and Aim: The concept of locus of control refers to the degree in which a person perceives daily occurrences to be a consequence of his or her own behavior. Some people accept responsibility of their own continued well-being and maintained improvement, but the others, particularly those who do not accept this responsibility, may be at risk of relapse. It recommends a kind of measurement in order to identify such persons so that further steps can be taken to inhibit the relapse before occurs. One of this measurement is Locus of Control of Behavior. The purpose of the present study is to translate the Locus of Control of Behavior (LCB) into Persian and investigation of validity and reliability of the scale.

Materials and Methods: In this research, 35 adults with stuttering and 35 non-stuttering were evaluated. After the translation of the test according to Protocol IQOLA and its equalization to Persian Language, content validity and face validity of it were determined by the opinions of experts. Then, for concurrent validity determination 35 adults with stuttering were examined by LCB and Rotters locus of control .In order to test reliability, test –retest and Cronbach,s alpha were used.

Results: Entirely relevant items had simple translation. The translation items had content and face validity. Correlation between the marks of LCB and Rotters locus of control was (p=0.000, r= %53). LCB has high Test-retest (p=0.000, ICC= %87) and internal reliability (p=0.000, α=%85).

Conclusion: The present research showed that the Persian version of the LCB is a reliable and valid tool for locus of control from the perspective of a person who is stutter.

Key Words: Stuttering, Reliability, Validity, Locus of Control of Behavior