5S concept is reference to a list of five Japanese words which transliterated and translate into English, start with the letter S and are the name of a methodology. The 5S methodology that including the Seiri (organization), Seiton (neatness), Seiso (cleaning), seiketsu (standardization) and shitsuke (discipline), is used as a platform for developing an integrated management system by the parallel use of total productive maintenance (TPM) (Bamber et al., 2000). The practice of 5S aims to embed the values of organization, neatness, cleaning, standardization and discipline into the workplace (Osada, 1991). Besides, the 5S concept also widely apply into warehouse management because the 5S concept are emphasize on the effective organize and arrangement of the item in the warehouse in order to eliminate the unnecessary items from the warehouse for improve the efficiency of the storage methods. The implementation of 5S concept also can uncover hidden problems that may have otherwise remained unnoticed. According to Rod Gapp, Ron Fisher and Kaoru Kobayashi (2008), the benefit and advantages of implementing the 5S can be summarize as follow:
• Orderliness (seiri and seiton) – can maximize the efficiency and effectiveness of the warehouse operation, productivity and cycle time performance by reducing the employees workload and human errors through simplify the process in the material handling in order to reduce the warehouse order cycle time and increase inventory turnover.
• Cleanliness (seiso and seiketsu) - to maximize effectiveness by contributing to a healthier life, safety and wellbeing as well as enhancing transparency. The comfortable working condition can motivate the employees to work hard for the company that can directly increase the warehouse productivity performance. In addition, the cleanliness of the warehouse can prevent the pollution cases from happening to care for the welfare and right of the employees