This short position paper promotes the need for more evidence based practice to underpin the successful execution of information systems (IS) projects. This research responds to the high numbers of IS projects that are seen to have failed in terms of either one or many success criteria such as: not meeting original objectives, running over budget, negatively impacting on people, processes or organizations, to name but a few. We advocate the need for the development of a more rigorous evidence base for IS research similar to those used in medicine or more recently in social studies and software engineering. For example, Systematic Literature Reviews (SLRs) and also Meta-Analysis of empirical research studies could be used more extensively within IS to compile more coherent, consistent and referable bodies of evidence and knowledge. We conclude with a 7 point action plan and suggestions for further research.