最初，开发项目经理担当主要产品负责人的身份。
Initially, the development project manager was positioned as the primary Product Owner.
项目经理可能想改进对于未来新的和维护开发活动的估计。
A project manager may want to improve estimation for future new and maintenance development activities.
项目经理可能想改进对于未来新的和维护开发活动的估计。
A project manager may want to improve estimation for future new and maintenance development activities.
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