การจัดการสินค้าคงคลังของห้างหุ้นส่วนจำกัด ซายน์ แอนด์ เมด

Abstract

The purposes of the development of inventory management of Sci and Med Limited Partnership were 1) to study and improve the inventory management system 2) to increase the efficiency of inventory management system 3) to save the total cost and 4) to meet the products’ demands. The ABC Analysis theory has been implemented and grouped by the level of importance of each product. The products that are categorized in group A were used to calculate the Economic Order Quantity (EOQ), safety stock level and the appropriate Reorder point (ROP). The study found out that products has 5 categories of products available in 2017 – 2019. The researcher brought all these categories to analyze for a purpose to separate the valuable products by using the ABC Analysis theory. It was separated into three parts: group A, there were 31 items which is cost 5,294,413.33 THB and it represents 74.98 percent of the overall products in the study. The researcher analyzed the products in group A to EOQ and ROP in order to specify the service level at 99 percent. The adjusted EOQ by actual purchase agreement clause were used in the study. The analysis would calculate from the ordering cost and the holding cost to find the total cost and to compare the result before and after researching. The results show that the ordering costs decreased by 40,552.28 THB from 206,872.75 THB to 166,320.47 THB due to the decreased number of orders. While the holding cost decreased by 14,056.63 THB from 274,074.80 THB to 260,018.17 THB due to fewer stock in the inventory. Although there is an increase in the opportunity cost by 6,302.25 THB the total cost was relatively small. As a result, the total cost decreased by 48,306.65 THB from 480,947.54 THB to 432,640.89 THB. The result of Reorder Point (ROP) found out that the reorder point was higher when compared with the original working form. However, the average inventory decreased by 14 items from 420 items to 406 items which the average inventory value decreased by 75,278 THB from 727,796 THB to 1,652,518 THB per year.