What is third-party assurance?

1. 01

   The request arrives

   Usually from procurement or a customer's security team, often with a deadline attached to a contract date. The commercial clock is the constraint that makes these painful.

2. 02

   Understanding what is really being asked

   Questionnaires ask the same underlying things in different formats — SIG, CAIQ, and countless bespoke spreadsheets. Recognising that one question maps to a control you have already documented is most of the efficiency available.

3. 03

   Assembling evidence

   Policies, certifications, architecture descriptions, prior test reports, insurance. The organisations that handle these well keep an evidence library current; the ones that struggle rebuild it every time.

4. 04

   Answering accurately

   Every answer is a representation to a customer. Overstating a control is a contractual risk that surfaces at the worst possible moment, so where something is not in place the right answer states the compensating control or the remediation date.

5. 05

   The follow-up round

   Reviewers almost always come back with clarifications. Budgeting for a second round is realistic; assuming submission ends the work is not.

6. 06

   Building for reuse

   The first questionnaire is expensive. It should make the next one cheap, which only happens if the evidence is captured somewhere reusable rather than assembled ad hoc and lost.

Common questions

What is third-party assurance?

Third-party assurance is how an organization demonstrates its security and compliance to the customers, partners, and regulators who vet it as a vendor. In practice it means responding to security questionnaires like the SIG and CAIQ, RFIs, the security sections of RFPs, and customer audits, with accurate answers and supporting evidence. It is how you prove you are a safe party to rely on and keep security from stalling your deals.

What is the difference between third-party assurance and third-party risk management?

They point in opposite directions. Third-party assurance is outbound: you prove your own security to the customers vetting you. Third-party risk management (TPRM) is inbound: you assess the security of the vendors and suppliers who touch your data. If your customers are sending you security questionnaires, you need third-party assurance; if you are the one assessing vendors, you need TPRM.

What does third-party assurance involve?

It involves responding to vendor security questionnaires (such as the SIG and CAIQ), answering the security sections of RFIs and RFPs, supporting direct customer security reviews and audits, and maintaining a reusable library of policies, certifications like SOC 2, and audit reports so every request is answered from a single source of truth.

Why do customers send security questionnaires?

Because your security becomes their risk. If you hold their data or connect to their systems, your weaknesses are a path into them, and their own compliance obligations require them to assess that. The questionnaire is how that assessment is usually performed, and increasingly it gates the contract.

What is the difference between SIG and CAIQ?

Both are standardised questionnaires. SIG, from Shared Assessments, is broad and comes in full and lite versions covering many risk domains. CAIQ, from the Cloud Security Alliance, is aimed specifically at cloud service providers and maps to the Cloud Controls Matrix. Many enterprises use neither and send their own spreadsheet, which is the case that consumes the most time.

Can a SOC 2 report replace answering questionnaires?

It reduces the work substantially but rarely eliminates it. Many customers will accept a SOC 2 Type II in place of most questions, and it is usually the highest-leverage investment for a company that receives questionnaires constantly. Expect to still answer a residual set covering things outside the report's scope.

What happens if we answer inaccurately?

Answers in a security questionnaire are representations to your customer and frequently referenced in the contract. Overstating a control creates real exposure that surfaces at the worst moment — during an incident, or when the customer audits. Where a control is not in place, stating the compensating control or a remediation date is both safer and, in our experience grading these, better received.