Generally, evidence from a well-designed Random Controlled Trial (RCT) is accepted as having a high level of strength for efficacy. From the literature review, none of the outcome studies investigating the efficacy of yoga treatment for PTSD have been conducted by using RCT design. Most of the studies lack treatment control subjects and rely on data from only one program. Thus, it is expected the Multi-Component Yoga Intervention (MCYI) will be the first RCT study conducted internationally and will contribute significantly to the field of mental health and psychiatry.