Where; N is the sample size of each group, P is prevalence in standard intervention/control arm, d: the real difference between two treatment effect (d= Po-Px); 22%-9%=13%=0.13); δ0: a statistical acceptable margin (5%); ɑ: is the significance level which is 95% confidence level (ɑ=1-0.95=0.05=1.645), ß: is 80% power (ß=1-0.8= 0.2 = 0.845, and adding Then, considering 10% for potential non-achieved rate compensation. The calculated sample size for a group is 364. Eventually, as a result of the complex sampling design (multistage, stratified and systematic sampling), design effect is considered increase power and precision of the study. Design effect was computed using a finding from complex sampling design study conducted in Ethiopia (Fagitalekoma district) reported that the prevalence of DVAW was 78%, and a clustered randomized control trial done in Uganda indicated that 22% of women experienced physical IPV in the standard intervention group. The final sample size for the three arms was 1,758 women that mean 586 for each group. The number of participant in the qualitative study will be determined by information saturation during interviews and or focused group discussions (FGD). A minimum of two FGD (one male group and one female group) which comprise 8 to 10 discussants will be held at each selected kebeles. The local leaders or other person who are in-charge will be participated on the selection of qualitative study participants until information saturation.