Measuring and evaluating nurses’ performance are vital to identify areas for improvement in maintaining quality of service delivery and ensuring sustainability of current practices. This study attempts to examine the content validity of the nurses’ performance scale. It is also aimed to achieve acceptable criteria for content validity of this instrument. Construct and content domain of nurses’ performance were identified followed by items generation and instrument formation. Subsequently, assessments of content validity were performed based on content validity Index (CVI), Inter-rater agreement percentage (IRA%) and modified Kappa statistic. Two level of judgement were performed using the lay expert panel and research expert panel. Criteria were established based on these indices as basis for item reduction process. Pilot study was conducted on 50 respondents to assess the internal consistency using Cronbach’s alpha value of finalized NPQ instrument. 71 items are yielded during developmental stage of instrument to measure four dimensions of nurses’ performance. Assessment of content validity based on lay and research expert judgement resulting in elimination of 27 items (38%). Computed modified Kappa statistic further supplemented that the remaining 44 items as ‘excellent’. As for conclusion, NPQ instrument has attain acceptable criteria of content validity assessment utilized in this study and therefore proved its potential for further research

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