Construction Standard Production Unit system(CSPU) is used for estimating the cost of public construction projects. However, It is questionable if the reliability and/or authenticity of the system is acceptable due to the lack of consistent enactment and/or revision procedures. This study identifies operational conditions and issues relative to using daily work report as a data collection method for enacting and/or revising CSPU system, and establishes the measures for improving the daily work report. The standard format of the daily work report proposed by this paper is established by obtaining and reflecting expert opinions from construction field engineers and/or managers. This study contributes to improve the authenticity of operational data obtained from daily work report.