The aim of the present study was to determine the psychometric properties of the Iranian version of the stages of
change readiness and treatment eagerness scale, which had been translated and cross-culturally modified into
Persian language and back-translated to English. Most specifically, the study sought to validate the Iranian
version of the stages of change readiness and treatment eagerness scale, based on the evaluation of two experts.
An additional objective was to test the translated instrument for its reliability. For this purpose, the validated
instrument was administered to 80 male drug addicts, who were outpatient services at a government
rehabilitation center. The results showed the both experts indicated that the items of the translated instrument had
very high relevance to their present context. The inter-rater reliability of the scores given by the two experts
indicated .805 between the experts’ scores for the total scale.
The findings showed that the alpha coefficients for the total scale scores at pre-test and post-test were .832
and .787, respectively. Also, the results indicated that the alpha coefficients for all the subscales of the translated
instrument at pre-test ranged from .69 to .81. In all the subscales, alphas at post-test ranged from .66 to .79. The
Pearson correlation test indicated a high correlation coefficient of .86 between test and retest. In short, the study
showed that the translated instrument has very high content validity and high reliability and that it can be used to
assess motivation for behavior change and predict treatment outcomes in drug addicts that are receiving
treatments in Iran.