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What is three-point estimation?

In the three-point estimation, three values are initially produced for every task based on previous experience. For example, to complete a specific task the different possibilities are:

  • Best case estimate: 120 man-hours or 15 days with experienced team members
  • The most likely estimate: 170 hours or 21 days with enough resources and moderate team members experience
  • The worst-case estimate: 200 man-hours or 25 days and with a team that has lesser work experience