Study in work design and work performance concepts is incredibly limited in library fields. The instrument of both concepts is almost nonexistence. Therefore, the objective of this study is to propose a set of instrument to measure both concepts. The questionnaire was developed based on, task performance, contextual performance, task character and knowledge characteristic. The items in the questionnaire were developed based on the proposed conceptual framework of the previous study. To report content validity for the instrument, the researcher conducted several pretesting sessions to review the instrument. The feedbacks from experts during pretesting were analysed. 326 respondents were involved during the pilot test session of the instrument. The data were analysed using SmartPLS to identify the convergent validity (AVE), Cronbach's alpha, and factor loading for each dimension. The reliability of the proposed instrument was identified, the results of Cronbach's alpha for each dimension are strong to represent the study.