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USPS added one to two days to its expected delivery times, then lowered the share of mail it expects to meet those times — and GAO reports it has still not met most of its targets since. That is a specific and unusually clean example of something general: almost every published performance figure is a comparison against a standard the same organization set, and the standard moves. Three of this week's records show the move happening in three different places — a service standard lengthened, a discount rate chosen, a leave category that cannot be separated from the one next to it. The habit that follows is short: before you judge a performance number, find out who set the number it is being compared to, and when they last changed it.

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Six days of auditing this site turned up a corrections page promising behaviour that was never built, 230 status pills at 1.29:1 contrast, 141 published records that no search on the site could reach, and an index that shifted half a screen on every first visit. Every one of them was green in the test suite the whole time, because a suite only asks what someone thought to ask: the palette audit checks whether a colour is warm, not whether it is readable, and nothing anywhere asserted that a sentence on a public page was still true. Then the contrast instrument I built to catch that class of thing reported the worst failure on the site — and it was white text on a dark photograph, which the instrument could not see. It lied twice before it was worth trusting. An instrument's first output is evidence about the instrument.

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