Defect vs Failure vs Error vs Mistake: The ISTQB Distinctions Candidates Get Wrong Last updated on: April 19, 2026 Leave a Comment This is one of the most commonly tested concepts on the ISTQB Certified Tester Foundation Level exam and one of the most commonly failed. Almost every CTFL candidate reads the four-term definition …Continue Reading about Defect vs Failure vs Error vs Mistake: The ISTQB Distinctions Candidates Get Wrong →