<![CDATA[Employee performance measurement is crucial because as a result as a means of evaluation, development and decision making in the organization. For this reason, the validity and reliability of employee performance instruments are determining factors to ensure that the data obtained is accurate or not. This research aims to develop and validate private employee performance instruments in the Southwest Papua region. This research was conducted using quantitative methods. The sampling technique used in this study was random sampling technique. The population in the study were private employees as many as 75 respondents who would be used in representing the population of respondents in Southwest Papua. In this study, the software used to analyze the data is Ministep Rasch to see the relationship between items and respondents. Based on the analysis, item 5 is difficult for respondents to agree and item 9 is easy for respondents to agree. This shows that the tool developed has good validity. In addition, there are results of the validity test of items 11, 10, 5, 12, 9 and item 4 that do not match (FIT model). Cronbach's Alpha value of 0.92 can be said to have a very good value related to items and people. This research was conducted by analyzing the results of difficulty (Item Difficulty), analyzing the level of fit on items or FIT (Item fit), and the level of reliability (item reliability).]]>
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