中文摘要：

心理变量赋值是管理学研究中的基础问题。量表赋值法是常使用的方法,该方法具有较强的主观性,其线性赋值关系与心理物理基本定律相悖。基于此,以科学管理中的知识作业管理为例,将知识作业难度作为研究对象,反应时是作业难度的客观反映。分别采用语义难度（心理变量）评价和反应时实验采集数据的方法,通过比较二者之间的关系,证实了心理变量的数值关系非线性,即心理变量赋值数量关系应服从Stevens定律。采用的实验研究方法以及提出的心理变量幂函数赋值理论模型,是对管理学之心理变量进行客观度量的有益探索。

英文摘要：

The evaluation of psychological variable is the basic issue of management science.The usual assessment and scoring method for psychological variable is Likert-type scale.Not only the linear evaluation is subjective,but also it is inconsistent with the psychological law.Based on RT（reaction time） experiment,this paper discusses the difficulty of knowledge work as an example.According to the comparative analysis of both the RT data and semantic estimation,the evaluation and scoring of a psychological variable should be nonlinear,i.e.quantitative relation of the evaluation of psychological variable summit to Steven＇s law.The empirical research method and the power function evaluation of psychological variable model are useful efforts for objective evaluation of management variable.