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The AWD Mranggen store is a store that is engaged in the sale of bags, belts, shoes with sales developments increasing from year to year, with fairly tight business competition, the AWD Mranggen store must be able to calculate the estimated number of items to be purchased based on previous sales data, the prediction is very influential on the decision to determine the number of items to be provided by the AWD Mranggen Store for the next sales period data. Inventory of goods that are not right cause some losses in terms of time and also costs, it is necessary to have a forecasting system. Forecasting is a technique to identify a model that can be used to predict conditions in the future. By using the weight moving average method, it can be seen that the error value is more than smaller than other methods and the estimated results can be more precise so that it can help owners make decisions in carrying out inventory.

The inventory system is one of the most important managerial functions, because the majority of companies involve large investments in this aspect, as well as for PT Sango Ceramics Indonesia which uses a lot of inventory in the field of planning and controlling its inventory costs. PT Sango Ceramics Indonesia is a company engaged in the ceramic industry. Problems that often occur so far include the company not determining the frequency of ordering raw materials and storing raw materials, as a result the costs incurred by the company for ordering raw materials are quite high, and the absence of a safety stock to anticipate uncertain inventory needs. The Periodic Review method is a method that can help the process of controlling raw material inventory costs. This method uses an approach to the concept of the number of orders economically used in each period which is a diverse demand. The application of the Periodic Review Method (R, s, s) policy on the inventory system is able to produce a lower total inventory cost, order volume and inventory levels in a balanced manner. . Judging from these problems, the authors need to redesign the stock information system using a computer-based system, namely Microsoft Visual Basic. System design using Qlient Server which consists of input design, system design and procedure, output design fiber. This new system is expected to be able to overcome the weaknesses of the previously used information system.

The textile and textile products (TPT) industry in Indonesia still has a lot of problems, one of which is the problem of raw materials which are considered to be unable to compete with the same material from importation sources. This requires the company continue to strive to increase productivity and cost efficiency to mitigate the increase in prices of raw materials charged to consumers. One effort that can be done by the company is to improve the efficiency of the cost of raw material inventory. The company must be able to plan and control the company's raw material inventory to support the effectiveness of its raw material costs. By having good planning and control, the company will avoid the problem of excess and lack of raw material inventory in carrying out production activities. This study aims to determine the application of the Justintime system at PT Bintang Baru Sentosa in increasing the efficiency of the company's raw material inventory costs. The type of research is quantitative qualitative research with a case study approach. Data sources obtained from primary data and secondary data. The methods used in this study include: interviews, observation, and documentation studies.The results of the study show that using Justintime in controlling raw material inventories has cost efficiencies of Rp18.418.185,- for 75/72 F DTY and 150/48 F DTY with a cost efficiency level of 75%.  Keyword:Raw Materials, Inventories, Just.intime (JIT), Cost Efficiency