While several knowledge management systems' (KMS) success measures have been developed in previous studies, most of them focus on the measurement of knowledge use and performance of KMS. Little research has been conducted to develop specific instruments for measuring KMS success from the perspective of KMS knowledge production. Thus, the objective of this study was to develop an instrument for measuring userperceived knowledge and information quality (KIQ) of KMS from the side of knowledge production. In this study, the characteristics of KMS were firstly analysed, and previous instruments for measuring information quality and KMS success then reviewed. Finally, an instrument for measuring the construct of KIQ in the KMS context was developed and validated in terms of its psychometric properties. The proposed instrument will be of value to researchers and practitioners interested in designing, implementing, researching, and managing KMS.