At the British Cabinet Office there is a review moment with a precise name: Gate 5, in full the "Operations Review and Benefits Realisation". While most project governance stops the moment delivery is signed off, this review moment is where the real work only just begins — with the question of whether the promised benefits have actually been realised.
What Gate 5 actually is
Gate 5, formally called "Operations Review and Benefits Realisation," is part of the Gateway Review system, which was managed by the Cabinet Office and the Infrastructure and Projects Authority (IPA, now folded into NISTA). It is an assurance review carried out at one or more points after a project's delivery, with a very specific goal: independently assessing whether the benefits from the original business case have actually been realised, or are on track to be.
Gate 5 is relevant as a reference point for any organisation serious about ex-post evaluation, and that comes down to three traits. The review is explicitly independent and external: not the project team assessing its own result, but a separate party testing it with a critical eye. Gate 5 also looks forward rather than only backward: is governance in place to keep measuring benefits over the longer term, now that the project has closed and attention to it can quickly fade? And Gate 5 tests whether the original business need, the reason the project was started in the first place, still exists. That last question is surprisingly fundamental: sometimes the world changes faster than the project, and the question is no longer whether the benefits were realised, but whether they are still relevant.
The difference with an internal Post Implementation Review
Within the same British governance structure there is also the Post Implementation Review (PIR): an internal document in which the project team itself looks back and records lessons. The key distinction: Gate 5 uses the PIR as input, but stands explicitly separate from it. The PIR confirms that lessons have been recorded; Gate 5 independently tests whether the benefits are actually there. An internal self-assessment is therefore not enough, an external check must be added on top. That is precisely the institutional precedent for a principle that recurs in virtually every evaluation framework: self-evaluation without challenge is a weak form of evaluation.
What Gate 5 is not (and that matters just as much)
Two claims about Gate 5 that sound appealing but do not hold up: that it follows a fixed, periodic cycle over a system's entire operational lifespan, and that it comes with a mandatory lessons-sharing requirement through a central portfolio office. On closer inspection, neither claim is substantiated. What is solidly supported: Gate 5 is a standalone, independent assurance moment focused on benefits realisation, not a continuous or automated process.
Why this is relevant beyond the British government
Most organisations have no Gate 5 equivalent. What often does exist: a business case with a benefits section that is never reopened after delivery. The question Gate 5 asks (were the benefits we promised upfront actually realised, and who is keeping watch?) is a question that is often missing entirely from ex-post evaluations, or is answered at best superficially with a general statement of satisfaction rather than a concrete test against the original business case.
How this comes back in an evaluation report
An evaluation report that takes the Gate 5 principle seriously does three things: it compares the realised benefits, quantitatively or qualitatively, with what the business case stated, it assesses whether those benefits are expected to persist (sustainability), and it names who is responsible for follow-up measurement after the project has closed. That last point is the one most often forgotten in practice: a project closes, the team is disbanded, and no one remains the owner of the question of whether the benefits are actually landing.
This is precisely category 2 of the EvaluatieScore rubric, benefits realisation versus the business case, with three sub-criteria directly derived from Gate 5 and the related OECD sustainability criterion: have benefits been tested against the business case, are they sustainable, and is there ownership for follow-up measurement?
Upload your report for €15 at dutchmind.com/producten/evaluatiescore — the scan automatically checks whether category 2, benefits realisation versus business case, holds up.
Sources
- HM Government / Cabinet Office–IPA (nu NISTA) (2021), Gate 5: Operations Review and Benefits Realisation (Assurance Portfolio Standard, V1.0) — assets.publishing.service.gov.uk.
- OECD DAC Network on Development Evaluation (EvalNet) (2019), Evaluation Criteria (herzien, DCD/DAC(2019)58 FINAL) — one.oecd.org.