Proportionality is the test the Equality Act’s exceptions and the public sector equality duty both lean on, and it is the standard a tribunal will apply to any decision that departs from equal treatment. This page sets out the four-limb idea at framework level — without walking a worked example, because that is what the Proportionality Check delivers — and explains why the reasoning being recorded is the part organisations most often miss.
The four limbs at framework level
Proportionality, as developed in public-law cases and applied to the Equality Act, asks four questions together. First, is the objective sufficiently important to justify limiting a right — a legitimate aim, not an administrative preference. Second, is the measure rationally connected to that aim — does it actually advance it. Third, is no less intrusive means available — could the aim be met in a way that interferes less. Fourth, is the balance struck fair — does the benefit outweigh the harm to the person affected.
All four have to be answered together. A measure that passes three and fails one is not proportionate. The test is a judgement, not a checklist, but it is a structured judgement — each limb has to be addressed, not gestured at.
Why blanket rules cannot pass
A blanket rule fails the third limb almost by definition, because it does not consider whether a less restrictive option would meet the aim in the individual case. It also fails the fourth, because it applies the same harm to every person regardless of circumstance. That is why blanket exclusion is the riskiest option available, not the safe default. The manager decision framework sets this out in the single-sex context; the logic holds across any proportionality-governed decision.
The real exposure is unrecorded reasoning
The limb that catches most organisations is not the fourth — it is the absence of any written reasoning at all. A proportionality judgement that exists only in someone’s head cannot be tested, revisited or defended later. As the defensible decision-making explainer puts it, undocumented reasoning is functionally indistinguishable from no reasoning once it is challenged. The paper shield piece sets out the data behind that gap — policy without infrastructure, guidance without review, process without documentation.
What a defensible record looks like
The record needs to show, on the day the decision was taken: the question, the facts, the legal basis, the options considered, the proportionality rationale applied to the specific case, and the review date. It does not need to be a legal treatise; it needs to show the reasoning happened and was not reconstructed afterwards. That is the difference between a decision that holds up and one that does not.
Where proportionality is doing real work in a live decision, paid support is the right floor. Proportionality Check runs the four limbs on your facts; Defensibility tests the judgement against the scenarios a challenge would bring; Consulting weighs it with you end to end.