Successful agile implementations for IT development processes have revolutionized the way in which software is being delivered. During the last decade success factors of agile development research developed rapidly, and an increased attractiveness of the agile methodology for large scale set-ups has surged. This dissertation proposes a model consisting of six factors that that influence the success of large scale agile IT development project, qualifying success in terms of cost, time, scope and stakeholder contentment. A 5 point Likert-scale type survey was sent out to 85 agile practitioners. Statistical analysis carried out via SPSS v. 21.0. Suggest that personal characteristics, technical capabilities as well as a company´s management commitment play a crucial role in the success of large scale agile development processes, while the company’s organizational culture seems to be unconnected.