This paper, is a summary of a Doctoral thesis with title of "Design And Definition Of Information System Service Quality Assessment". After a survey in the literature review and having done a historical research, the author defines his proposed model. It should be mentioned also that experts in both university and auto- industrial areas have confirmed it and it includes six major elements of: tangibles, reliability, responsiveness, assurance, empathy & human - machine interaction. Every dimensions is measured by some criteria and a total of 25 criteria are evaluating the Information System Service Quality and has been implemented in one of the dependent companies of auto- industry.