Myth: a longer questionnaire gives better assurance. Fact: length mostly gives you more answers to read and more chances for rushed copying. Good assurance comes from the right questions for the vendor's tier, evidence on the few that matter, and follow-up on anything odd.
Myth 1: More questions means more safety
Standard questionnaires vary widely. A licensee's summary of the 2025 SIG, for example, reports 128 questions in the Lite version and 627 in Core. Neither number guarantees a better answer. A vendor that rushes through 627 yes or no rows tells you less than one that answers 30 carefully with evidence.
Myth 2: A high score means a secure vendor
Scoring schemes count answers, not control strength. A vendor can score well by answering "yes" to everything, and a candid vendor can score worse by admitting gaps. Read answers, not totals.
Myth 3: Every vendor needs the same one
Sending the full set to a calendar app wastes both sides' time. Match depth to tier. Our guide on tiering vendors shows how.
Myth 4: Yes or no answers are enough
Closed answers hide scope. "Do you encrypt data?" gets a yes whether it is one database or all. Ask for the scope and the setting in a short comment.
Myth 5: Self-assessments are worthless
They are useful as a starting point and for comparability, as the Cloud Security Alliance's own CAIQ shows. The CSA states that the CAIQ is a self-assessment and not a certification. Use it for what it is, then verify where risk is high.
Myth 6: Evidence requests insult the vendor
Mature vendors expect them. Ask for the smallest piece of evidence that settles a point: a screenshot of a setting, a redacted report page, a dated review record.
Myth 7: If it passed last year it passes this year
Vendors change. Review on triggers as well as dates. See annual questionnaires versus monitoring.
What to do instead
- Choose the shortest standard questionnaire that fits the tier.
- Add five to ten questions specific to your use case.
- Pick the three answers that matter most and ask for evidence.
- Record the answer, the evidence and the decision.
- Revisit on triggers.
A fair test of your own process
Take your last completed questionnaire. Did anyone read every answer? Did any answer change a decision? If not, shorten the form and spend the saved time on follow-up.
Quick check
What is a sensible number of questions?
There is no magic number. Use a short set for low risk vendors and a fuller set for critical ones, then verify the key answers.
Should we drop questionnaires entirely?
No. Pair a short one with independent reports and evidence where risk is high.
Sources
Last reviewed: 19 October 2026.
