Pull system is one of the crucial elements in just-in-time (JIT) manufacturing (Ou & Jiang, 1997). JIT was introduced by Toyota in Japan as an effective production control system to produce the right quantity of parts for the right location at the right time with competitive cost (Savsar, 1997). In a pull system, the start of a production is triggered by the completion of another at the downstream station (Spearman, Woodruff, & Hopp, 1990). Therefore, a loading schedule is not required. The pull system heavily relies on visual management, which allows prompt detection of operational problems, e.g., machine failure