The staff members who will perform activities will most accurately estimate them. In this case, team members use expert judgment because of their experience with similar activities in the past. You should be careful with these estimates, though, because they are subject to bias and aren't based on any scientific means. Your experts should consider that resource levels, resource productivity, resource capability, risks, and other factors can impact estimates. It's good practice to combine expert judgment with historical information and use as many experts as you can.
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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.