Task design variables include task input, task condition and task outcome varia-bles, and each variable still includes some design factors.
任务设计变量包括任务输入变量、任务条件变量和任务结果变量，每个变量又包含一些任务设计因素。
3
This paper reviews the work from three respects. (1) The work makes use of a vast quantity of documents , of which 83 per cent are foreign ones , and is attached with lots of ta- bles and figures.