Efficacy has been defined as the extent to which a specific intervention, procedure, regimen, or service produces a beneficial result under ideally controlled conditions when administered or monitored by experts. Stuttering is one of the commonest speech disorders that is difficult to be treated. Subjects and methods: In this study a sample of 80 Arabic speakers, aged between 3-35 years, who stutter were included. They were divided into two equal groups, one was treated by technique of coordinated respiration and articulation and the other group was treated by Van riper method. The study considered key determinants of efficacy as measurement, treatment integrity, and design issues. A set of criteria is given and a meta-analysis of whether the technique of coordinated respiration and articulation is effective in treatment of stuttering in comparison with stuttering modification therapy (Van riper method). Assessments of stuttering include: the degree of severity assessment, Bloodstein's developmental phases and the stuttering severity instrument. Results revealed significant difference between the two methods of therapy. Conclusion: coordinated respiration and articulation technique is more effective than Van riper method in treatment of stuttering.