What verification actually proves
A sign-in system, an access card record or a check-in at defined points proves presence. Some systems prove presence in specific areas, which is more useful, since a shift spent entirely in the amenities block would otherwise look identical to one covering the whole facility. None of them prove that a floor was scrubbed properly, that a spill was cleaned or that a periodic task was completed to standard.
That distinction matters because sites frequently invest in verification and then stop asking about quality, on the reasonable assumption that attendance implies work. On a large distribution floor it does not, because the work is largely invisible in the morning if it was done and only slightly more visible if it was not. Quality has to be checked separately or not at all. That is also why a site should decide what it actually wants to know before selecting a system, since the choice of points determines what the data can answer.
