前者的特征是确保具有提前了解需求的能力，因而可以制订确定性计划。
The former is characterized by the ability to know requirements with surety in advance, thereby making deterministic scheduling possible.
早期的开发活动应该旨在去掉不确定性，并且按计划的精度逐渐的增加。
Early development activities should aim to drive out uncertainty and enable gradual increases in planning precision.
不确定性的一个原因是试图计划很远。
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