All of these problems actually require a higher level of planning.
所有这些问题其实需要更高层次的规划。
First of all, it is necessary to improve the level of planning and design.
首先，有必要提高水平的规划和设计。
What level of estimation is required for each planning level?
对于每个规划阶段，需要进行何种程度的评估？
Therefore, upfront planning of the high level design and architecture is essential.
因此，最初的高层次的计划和体系结构的设计是必要的。
Production planning usually takes place only on one level of your product structure.
生产计划通常发生在你的产品结构中其中一层。
The economy of planning is plainly seen at the production level.
规划的经济性清楚地体现在生产水平上。
The economy of planning is plainly seen at the production level.
规划的经济性清楚地体现在生产水平上。
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