問8
頻出度★★★
図のDFDで示された業務Aに関する，次の記述中の a に入れる字句として，適切なものはどれか。ここで，データストアBの具体的な名称は記載していない。 - 顧客 →〔注文情報〕→ 業務A - データストアB → 業務A （データストアからの入力。矢印にラベルなし） - 業務A →〔出荷指示〕→ 出荷部 - 業務A →〔売上報告〕→ 管理部 業務Aでは，出荷の指示を行うとともに， a などを行う。
平成27年度 秋期 ITパスポート試験 問8
ストラテジ系システム戦略 › 業務プロセス
This question's explanation and your answers so far.
解説
問 8
Incorrectア
“Calculating the order quantity to the supplier” is a purchasing (procurement) task, and its result leads to placing an order with the supplier. However, task A in the figure has no output flow directed to a supplier and performs no purchasing. It is also unrelated to the sales report output, so it does not fit the DFD.
Incorrectイ
“Forecasting the timing and quantity of future orders” is a demand-forecasting task (sales planning / marketing). Task A outputs only the shipping instruction and the sales report, and the figure has no flow that outputs a forecast. Forecasting is outside the scope of task A, so it does not fit the DFD.
- ウ
正解 In a DFD, the processing that a process (task A) performs must correspond, without contradiction, to its input and output data flows. From the figure, task A has two outputs, the shipping instruction (-> Shipping Dept.) and the sales report (-> Management Dept.), while its inputs are the order information from the customer and a read from data store B, whose name is not given. The processing in blank a must be what produces this sales report. Choice ウ obtains the price information of the ordered product from the product-related data store (= data store B) and aggregates sales for each customer order (as quantity × price), which leads directly to creating the sales report. Because it is consistent with both the input (reading data store B) and the output (the sales report), ウ is appropriate.
Incorrectエ
“Calculating the required quantity of necessary parts” corresponds to MRP (Material Requirements Planning), a production-control / manufacturing task. Task A has no output flow related to parts or manufacturing at all; its outputs are only the shipping instruction and the sales report. Calculating part requirements does not correspond to task A's inputs and outputs, so it does not fit the DFD.
ここがポイント
- When reading a DFD, the processing a process performs must correspond, without contradiction, to the data flows (inputs and outputs) entering and leaving that process. The processing in the blank must be what produces task A's existing output, the sales report — that is, the aggregation of sales.
- Each choice represents a different business function: purchasing (ア), demand forecasting (イ), sales aggregation (ウ), and production / MRP (エ). The key is to read from the figure's output flows (shipping instruction, sales report) that task A handles the “sales” function spanning order receipt, shipping, and sales.
用語