Analysis of Inventory Management using Methodology Rop (Reorder Point) to Minimize Doi (Days of Inventory)

Authors : Abimanyu, Wawan Herwanta, Erry Rimawan

Volume/Issue : Volume 4 - 2019, Issue 7 - July

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Inventory is one of the fundamental problems in a company. Inventory can be interpreted as a stock of goods that will be sold or used for a certain period of time. Lack of inventory can result in cessation of the production process. This shows that inventory is a fairly crucial problem in the company. To control and control the stock in the warehouse, calculations and forecasts are really close. It aims to not cause a dead value for the item so that it does not have a sale value because it is too long in the warehouse. The variables used in this study are inventory variables as the dependent variable, while the independent variables are Safety Stock and Reorder Point. The population and sample in this study are products from the production of "XY" which will be marketed in all branches in Indonesia. Sampling is done by considering that the population is very large in number so that it is not possible for the entire population to be data. The product to be analyzed uses ABC for 20 products, the division in ABC analysis for each class is based on Pareto and product focus. class A is based on ABC analysis of 41 products, class B 72 products and class C 117. The author sets different service levels for each class based on the level of importance previously defined. For class A, the service level is set at 99%, while for class B it is 95% and class C is 90%. This service level is used for the calculation of reorder points and safety stock in the analysis to be discussed in the next point. Calculation of class A SS: 103 & ROP 151 Units, class B SS: 24 & ROP 48, class C SS: 28 & ROP 35. Based on data that has been obtained and processed based on ABC concepts, safety stock, and ROP. The DOI calculated using SS and ROP after grouping based on the ABC concept as seen in Figure 4 shows a positive trend, from the month of the month it shows an improving trend if we compare it to the lost opportunity obtained from the month. This is because the products are distributed evenly throughout the branches. The ROP concept is carried out to give a warning (poka- yoke) to everyone if the item will run out and must be refilled. If it is compared to the performance or sales achievement of the month, it can be concluded that there will be a positive trend also because the lost opportunity has decreased.


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