Certified Tester Foundation Level (CTFL v4.0) — Chapter 1: Fundamentals of Testing

Chapter 1 sets the vocabulary the rest of the exam is written in: why testing is necessary, how testing differs from debugging and from quality assurance, the seven testing principles, the activities of the test process, and the skills and roles a test team needs. Every question here is K1 or K2 — you recall or explain, you never calculate.

That makes it the cheapest chapter to secure and the most expensive one to be sloppy in: the distinctions defined here are reused as distractors in chapters 2 to 5.

Where candidates lose these points:

• Error, defect and failure — a person makes an error, which leaves a defect in a work product, which may cause a failure when the code runs. Options that swap two of the three are the standard trap.

• Absolute statements — "testing proves there are no defects" and "exhaustive testing is feasible for small systems" both contradict the principles explicitly.

• Testing vs debugging vs QA — testing finds failures, debugging finds and fixes their cause, quality assurance is about the process, not the product.

• Test objective, test condition, test case — three different levels of abstraction that questions deliberately blur.