Since 2001 Wikipedia has grown up to one of the most important sources of knowledge worldwide. The voluntarily and independent nature of the project has made it a very unique case of Information Systems with various elements which could affect the way each article is developed. In this paper by referring to the DeLone& McLean model of Information Systems success and considering the body of research in the field, the measures for evaluating the effectiveness of wiki articles have been identified. Then using a sample of 804 articles in Wikipedia and Structural Equation Model (SEM) method the model has been validated. The findings indicate that in the context of Wikipedia open content, system quality and information quality could be merged together and after this simplification, they can affect use and user satisfaction in open content platforms such as Wikipedia.