UNIX 的设计由大量的函数调用（称为系统调用）组成，其中包括一些简单的任务，如在屏幕上显示字符串来设置任务优先级。

The UNIX design consists of hundreds of function calls (called system calls) covering simple tasks, such as displaying a character string on the screen to setting task priorities.

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对目标规划中达成函数的优先级和权系数的选取提供了一种简单易行的方法——逐级调整法。

An easy method-successive adjust method is given to choose the priority and weight coefficient of procured function.

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