The performance of construction site tradespeople is one of critical factors to the success of any construction project. Poor quality of construction site tradespeople in the Indonesian construction industry contributes a major influence on the overall performance and efficiency of construction projects. In fact, contractors are still facing lack of site tradespeople’s skill to complete construction projects satisfactorily. Most "skilled" tradespeople enter construction industry and receive informal training from a master craftsman, rather than following a formal course conducted by an institution. This paper argues that well-trained site tradespeople have an important role in minimising the amount of construction waste activities during the construction process leading to reduce company’s productivity. The paper introduces a just-in-time (JIT) training program for construction site tradespeople, in which they are trained while they are doing a construction activity by receiving one-on-one instruction from a supervisor. Hence, the paper attempts to explore a significant role of JIT training program during the construction process and its relationship with construction site tradespeople’s productivity. Based on three case studies targeted at building construction in Indonesia, this paper states that a significant achievement in increasing company’s productivity has been attained by contracting companies that have conducted JIT training for their site tradespeople. Evidence of the increase of the company’s productivity is expressed by measuring the value of the PPC of the projects.
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