問15
頻出度★★☆
JAN コードを構成している項目の組合せのうち, 適切なものはどれか。 JAN コードの構成 : a, 商品アイテムコード, b
平成22年度 秋期 ITパスポート試験 問15
ストラテジ系法務 › 標準化関連
This question's explanation and your answers so far.
解説
問 15
Incorrectア
Both a and b are wrong. A JAN code shows which company made the item and which item it is, and it has nothing to do with the retail store where the item is sold, so it contains no retail store code (the same product has the same JAN code in every store in the country). Price is not included either.
Incorrectイ
The check digit for b is correct, but a is wrong. What goes at the front is not a retail store code but the manufacturer code (the GS1 company prefix). A JAN code exists to identify the product itself, and it has no field that identifies the store that sells it.
Incorrectウ
The manufacturer code for a is correct, but b is wrong. A JAN code does not contain a price. Prices differ from store to store and change over time, so a POS system uses the JAN code it has read as a key and pulls the price from the store's own product master. What goes at the end is the check digit, which detects reading errors.
- エ
正解 The correct answer is エ. A JAN code (Japanese Article Number) is a product identification number used in barcodes to identify goods worldwide; the standard type has 13 digits and the shortened type has 8 digits. From the front, the order is “manufacturer code (the GS1 company prefix; it begins with the country code 49 or 45, and GS1 Japan assigns it to each manufacturer)” → “item code (the number the manufacturer gives to each of its own products)” → “check digit (a checking digit).” The structure shown in the question puts the item code in the middle, so a is the manufacturer code at the front and b is the check digit at the end. The check digit is a single digit obtained from the preceding digits by a fixed formula; when the code is read, the same calculation is done and compared, which lets misreads and input errors be detected. Therefore エ, the combination a: Manufacturer code / b: Check digit, is appropriate.
ここがポイント
- JAN code structure = manufacturer code (GS1 company prefix) + item code + check digit. The standard type has 13 digits and the shortened type has 8, and it begins with the country code 49 or 45, which stands for Japan.
- A JAN code only identifies a product; it holds no price or retail store information. The price is managed by the POS system on the product master side and is looked up using the JAN code as the key. The check digit at the end is a checking digit for detecting reading errors.
用語