求翻译：前几代的时间管理注重完成工作的时间和工作量，而时间管理理论则更注重个人的管理，注重效能，关注完成的工作是否具有有用性是什么意思？

Previous generations of time management focuses on the completion of the work of time and effort, and time management theory is more focus on personal management, focusing on performance, concerned about the work done with the usefulness of

Previous generations of time management focuses on the completion of the work time, and effort, and time management theory is more of a personal management, with emphasis on efficiency, concerned about whether the work performed with useful,

The first several generation of time management attention completes the work the time and the work load, but time management theory then pays great attention to individual management, the attention potency, the attention completes whether the work does have usefulness

Time management focus on the completion of the previous generations of time and effort, and focus more on personal time management theory of management, focusing on effectiveness, attention to the work done with the usefulness

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