Expert judgment (ideally using experts with relevant, recent experience) is required to identify potential cost and schedule impacts, to evaluate probability and to define inputs (such as probability distributions) into the tools.
Expert judgment also comcs into play in the interpretation of the data. Experts should be able to identify the weaknesses of the toois, as well as their relative strengths. Experts may determine when a given tool may or may not be more appropriate given the organization's capabilities and culture.
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What you need to know about… Project Management Made Easy! Project management consists of more than just a large building project and can encompass small projects as well. No matter what the size of your project, you need to have some sort of project management. How you manage your project has everything to do with its outcome.