For buyers contracting authority
Pick 72226000 when the deliverable is independent testing and sign-off advice, not the software and not its day-to-day quality process. A contracting authority uses it to buy an acceptance test campaign, a pre-go-live validation, or an external party to run and document the test plan before a system is accepted.
The boundary that trips authorities is the sibling 72225000, System quality assurance assessment and review services. Quality assurance assesses the process and the artefacts on an ongoing basis; acceptance testing under 72226000 is the gate at the end that decides whether a specific delivered system passes. Where one contract folds both together, set the primary CPV code by whichever dominates the statement of work.
Two more neighbours matter. Software integration consultancy (72227000) is the right pick when the advice is about wiring systems together rather than testing the result, and the broad parent Systems and technical consultancy services (72220000) covers technical advice that is not scoped to acceptance testing at all. Reserve 72226000 for the case where the accepted, paid-for output is the verdict that the system meets its requirements.