Figure 2: an iteration goes through a lifecycle with a stronger focus on planning and architecture early and a stronger focus onbug-fixing and stabilization toward the end.
图2：每个迭代在经历一个生命周期时，早期更加关注计划和体系结构，后期更加关注修补漏洞和稳定性。
3
For more discussion on this issue, see my article "The Null Flag Bug Pattern".