Alphanumeric Code Verification Flashcards

Under time pressure, which strategy is most effective for comparing alphanumeric codes character by character?

Answer: Scan left to right, one character at a time, and stop at the first mismatch

A systematic left-to-right, character-by-character scan is the most reliable and efficient method for detecting errors under timed conditions.

Code on tray: 'SCF-R77-2B'. Code in database: 'SCF-R77-28'. What type of error is shown?

Answer: Substitution of 'B' for '8'

The letter 'B' on the tray replaces the digit '8' in the database at the same position, which is a substitution error.

A USPS clerk reviews five codes in 60 seconds and marks one as erroneous. Later review finds her marking was wrong — the code actually matched. What was the clerk's error?

Answer: She committed a false positive by flagging a correct code

Flagging a code that actually matches is a false positive error, reducing accuracy even though no real error existed.

Compare: '44-HHH-7C' (label) vs '44-HH-7C' (record). What is the discrepancy?

Answer: One 'H' was deleted from the middle segment

The label has three 'H' characters in the middle segment while the record has only two, indicating a deletion in the record.

Which of the following code pairs contains NO error?

Answer: 'CD-456-ZZ' vs 'CD-456-ZZ'

'CD-456-ZZ' vs 'CD-456-ZZ' is a perfect match with no discrepancy in any character position.

A code has two errors: '9P-LMN-44' vs '9Q-LMM-44'. Where are the errors located?

Answer: Position 2 (P vs Q) and position 6 (N vs M)

Position 2 shows 'P' vs 'Q' (substitution) and position 6 shows 'N' vs 'M' (substitution), giving exactly two errors.

A USPS examiner must decide: '3R-ZZ-100' (item) vs '3R-ZZ-100' (manifest). The examiner takes 4 seconds and passes the code. Was this decision correct?

Answer: Yes, the code matches exactly and is correctly passed

The item and manifest codes are identical, so passing the code is the correct decision regardless of how quickly the match was confirmed.