問24
頻出度★★★
式は定期発注方式で原料の発注量を求める計算式である。a～cに入れる字句の適切な組合せはどれか。 発注量＝（a＋調達期間）×毎日の使用予定量＋b－現在の在庫量－c
令和6年度 ITパスポート試験 問24
ストラテジ系企業活動 › 業務分析・データ利活用
This question's explanation and your answers so far.
解説
問 24
Incorrectア
b (safety stock) and c (current outstanding orders) are correct, but a is wrong. The period to multiply is the (ordering interval + procurement lead time) that covers the time until the next delivery, not the number of business days. The number of business days is merely a count of operating days and does not represent the period whose demand must be covered under the fixed-interval ordering method.
Incorrectイ
Not only is a wrong as the number of business days, but b and c are also swapped. The term to add should be safety stock (+b) and the term to subtract should be current outstanding orders (−c), yet this choice sets b = current outstanding orders and c = safety stock, reversing the roles of the signs.
- ウ
正解 Under the fixed-interval ordering method, an order is placed at each fixed ordering interval. The raw material ordered this time must cover the period until the next order arrives, so the period whose demand must be covered is (ordering interval + procurement lead time). Therefore a = ordering interval. Multiplying this by the planned daily usage gives the total usage for that period, to which we add b = safety stock to guard against demand fluctuation and delivery delays. We then subtract the current inventory already on hand, and further subtract c = current outstanding orders (orders already placed but not yet delivered) to prevent duplicate ordering. The combination a: ordering interval / b: safety stock / c: current outstanding orders is choice ウ, so ウ is correct.
Incorrectエ
a = ordering interval is correct, but b and c are swapped. Safety stock is the term to add to guard against shortages (+b), while current outstanding orders is the term to subtract because they are already arranged (−c). This choice assigns current outstanding orders to +b and safety stock to −c, reversing the meaning of the signs.
ここがポイント
- Under the fixed-interval ordering method, order quantity = (ordering interval + procurement lead time) × planned daily usage + safety stock − current inventory − outstanding orders. The period to cover is the (ordering interval + procurement lead time) until the next delivery.
- Meaning of the signs: safety stock is added (+) to guard against shortages, and current outstanding orders is subtracted (−) because they are already arranged, which prevents duplicate ordering.
用語