performance是可数名词吗（performance是可数还是不可数名词）

！performance是可数名词，performances中文意思是. 演出；[法]履行（performance 的复数形式）

One of the most important tools for organizational improvement is the performance appraisal.

组织改进的最重要手段之一是业绩评估。

Research on Job Analysis-based Performance Appraisal System.