6.2. Estimation Innovations
There are two general strategies for improving the accuracy of your estimates: help individuals learn to make better estimates or find ways to leverage the whole team's experience when making estimates. Individual Estimation Techniques can improve the accuracy of an individual's estimates. Delphi Ranking and Planning Poker are techniques that help a team derive accurate estimates from the estimates of individuals.
Surprisingly, some teams estimate more accurately when using "ideal engineer hours" as their estimation units, while others are more accurate with an abstract unit like "story nuts." If nothing else works, you could Change Estimation Units.
Figure 6.1. Pipelining iterations