To the effect of observational it is subject to be know factor that forms communication Word of Mouth and to know factor influence in communication Word of Mouth to Buy decision. Result observationaling to point out, formed 2 new factors namely Ministering Factors of variable Organic Word of Mouth and Goal Factor Perceives of variable Amplified Word of Mouth. Both of ala factor goes together significant to Buy decision but then partially point out influential more Service Factor dominant. Organic Worth of Mouth having dominant influence to be pointed out even with majority respondent group in observational it comes from outside another city Malang and also Batu