What does a double-entry check involve?

• A. It checks the data length twice.
• B. It verifies a single entry is sufficient.
• C. It validates the data type twice.
• D. It involves entering data twice to detect typing mistakes.

Answer: (D)

Double-entry check is a way to catch typing mistakes by requiring the same data to be entered twice and then comparing the two entries. The chance of two independent entries having the same typo is very small, so when the two copies match, you can be confident the data was entered correctly; when they don’t, you prompt a re-entry or verify the data. This method targets human error at the input stage and is not about checking data length or data type, which are handled by other validation steps. It’s also more reliable when different people or separate processes verify the entries, reducing the risk of repeated mistakes slipping through. In short, entering data twice and comparing the results is what a double-entry check is all about.