بررسی تاثیر عوامل خدمات پس از فروش در رضایت مشتریان، با استفاده از مدل تترا‌کلاس(مطالعه موردی گروه خودرو‌سازی سایپا)

Today the automotive industry as one of the high industries and have a lot of income for Owen countries, also each compony have much attention to it. Also attracting the customers, inside and outside the erea of country for automobile companies, have a severe competition for their. The purposes of this research, analysis and evaluation of services element Siapa after sale services in Shiraz. We use two questionnaire to appraisal, by using the classification sampling in 6 area of Shiraz, the data were gathered. In this research by using the regression tree analysis and correspoding analysis figurating the tetra class model. Finding presented empowered when the customer don’t receive the answer.