Inability to take decisions is one of the principal reasons for the failure of any project. Good project managers need to have proper understanding of various effective tools to manage triple constraints of any project i.e. time, cost and scope. In this article tools like SWOT Analysis, Maslow's Pyramid, Pareto Principle, Monte Carlo Simulation and Decision Tree Analysis are discussed. In the field of project management, these are regarded as highly effective tools for decision making. Please go through the link for more details: http://www.projecttimes.com/articles/decision-making-models-in-project-management.html