A user enters letters into a Quantity field that only accepts numbers

Field Test

The Phone Number field requires 10 digits and automatically rejects entries like “123-45-678”.

Field Test

During the processing of customer payments, the system frequently misinterprets handwritten invoice numbers. For example, the number “11807” is sometimes scanned as “I1807,” causing the payment to be applied to the wrong customer account. As a result, several customers received inaccurate account balance notices.

Field Test

When recording employee timecards, handwritten “7”s are sometimes interpreted by the system as “1”s during data entry. As a result, several employees' weekly hours were recorded incorrectly.

Field Test

A phone number field requires exactly 10 digits.

Field Test

Employee working hours entered must be between 0 and 24 hours per day.

Range Test

Credit limit for a customer must be equal to or greater than $0 and less than or equal to $1M.

Range Test

A payroll clerk accidentally entered an hourly wage of $850 for a part-time employee who earns $18.50, causing the payroll system to calculate an excessively high paycheck.

Range Test

A clerk enters Customer ID 98421, but this ID does not exist in the Customer master file.

Validity Test

A clerk entered a supplier number that does not exist in the vendor master file, causing the purchase order to be sent to an invalid or unknown supplier.

Validity Test

ZIP code exists

Validity Test

OrderDate is not future

Validity Test

Whether the customer ID, C4832, exists in the customer master file.

Validity Test

ZIP 92831 must correspond to California

Valid Combinations Test

Payment Method = Credit Card requires a Card Number field to be completed

Valid Combinations Test

A warehouse clerk accidentally selected product code A992 with warehouse location L03, even though that product is never stored in that location. The system processed the transaction, creating inaccurate inventory records.

Valid Combinations Test

User enters Customer ID 12345, then system displays: “Customer: ABC Electronics, Fullerton, CA” before the transaction continues.

Closed-Loop Verification

A clerk entering customer IDs frequently mistypes digits, resulting in orders being placed under the wrong customer. Because the system does not display the customer name after the ID is entered, the errors go unnoticed until invoices are sent.

Closed-Loop Verification

Entering a product code shows its description & price.

Closed-Loop Verification

A sales return should have a negative amount to reduce accounts receivable.

Sign Test

A clerk processing sales returns accidentally entered a customer refund of $145 as +145 instead of –145. As a result, the system increased the customer’s balance instead of decreasing it, causing inaccurate accounts receivable totals.

Sign Test

Employee ID must be exactly 6 characters. 12345 (Employee ID entry)

Length Test

Zip code must be 5 digits.

Length Test

While entering new customer records, a clerk mistakenly typed a 7-digit phone number into the field that requires a 10-digit number. The system accepted the entry, resulting in incomplete and unusable contact information.

Length Test