Although the causes for information technology (IT) project success and failure have been the subject of many studies, there has been relatively little attention given to how individuals attribute IT project success and failure. The purpose of this research is to determine how project managers attribute IT project success and failure. A questionnaire form was designed for study in this research and mailed to the 500 major manufacturing enterprises, ranked with respect to their sales from production in the year 2006, published by Istanbul Chamber of Industry. The questionnaire consists of three sections. The background information section addresses issues such as respondent's gender, age band, main job responsibility, the length of employment time; and organization's type, estimated annual turnover, number of employees, etc. The project failure section addresses issues such as involvement of the respondent, size and importance of the project, project failure reasons such as going over budget, going over time allocated, having no great organizational benefits, having low user satisfaction, etc. The project success section addresses issues such as involvement of the respondent, size, and importance of the project. Project success reasons such as staying within budget, staying within time allocated, having great organizational benefits, having high user satisfaction, etc. are studied.