When management has an understanding of predicted versus actual volatility, it is able to assess variance from plan and take steps to rein in projects that are heading out of control.

当管理层了解了预计的对实际的易变率时，就能够评估与计划的差异，并且设法控制正要脱离控制的项目。

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Variance analysis is an important decision support tool of activity-based cost management.

差异分析是作业成本管理中重要的决策支持工具。

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Considering the uncertainty of network model and time variability of network parameters, a fuzzy control active queue management algorithm based on input rate and queue variance is proposed.

针对网络模型的不确定性和参数的时变性，该文提出了一种基于输入速率和队列长度变化的模糊控制主动队列管理算法。

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This is where money management is key: position-sizing requires constant adjustment, especially during periods of wide variance.

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