ITPEC FE Subject A April 2025 Question 17

Logical Check (Input Validation) — identify the correct validation method for verifying business rules on input data.

The question asks which check ensures the order date is a business day on or before the entering date. This is a logical check — it validates whether data makes sense according to business rules.

Four types of input validation:
- Format check — verifies data matches expected format (e.g., date as YYYY-MM-DD, numeric field contains only digits)
- Duplication check — detects duplicate entries (e.g., same form number entered twice)
- Sequence check — verifies records are in expected order (e.g., form numbers are ascending)
- Logical check — validates data against business rules and real-world logic (e.g., order date ≤ today, quantity > 0, start date < end date)

Why not others:
- (a) Duplication check — checks for repeated records, not date validity
- (b) Format check — checks structure (e.g., YYYY-MM-DD), not whether the date is reasonable
- (d) Sequence check — checks ordering of records, not the meaning of a single field

Key rule: If the check involves comparing a value against business logic or real-world constraints, it is a logical check.

AI-generated — may contain errors