In conclusion, the most dominant variable on reinforced concrete labor productivity is experience (X5) with an β coefficient of 1.753. Based on the results of this study, namely from the F test, it was found that Motivation factors (X1), Skills (X2), Discipline (X3), Education (X4), Experience (X5), Wages / Salaries (X6) and Age (X7) had an effect simultaneously on the labor productivity of reinforced concrete, with the value of Fcount = 10.470> Ftable = 2.210. This study uses a survey method by capturing opinions, experiences and attitudes of respondents to obtain primary data through a questionnaire as a data collection tool and secondary from the related institutions.

The objectives of this research are to: 1) analyze the Labor Productivity Of Reinforced Concrete, 2) analyze difference in real labor productivity of reinforced concrete of the results of the study compared to the labor productivity of reinforced concrete of the Indonesian National Standard (SNI) 2002, 3) analyze what factors influence the labor productivity of reinforced concrete of office buildings of Bontang Kuala District in Bontang City, 4) Analyze the most dominant factors affecting the labor productivity of reinforced concrete in the construction of the office buildings of Bontang Kuala District in Bontang City.

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