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For the weekly summary, the total is ninety checks, compared with seventy-five last week. Please do not describe that as a fifteen per cent increase. The increase is fifteen checks, which is twenty per cent of last week’s total. We still need the number of working hours before comparing checks per hour.

There is another reason to be careful when interpreting this week's figures. Two experienced colleagues were temporarily assigned to training duties, while several simpler tasks were completed by a visiting team. A higher total therefore does not necessarily mean that every officer worked faster. We need to understand which activities are included and how much time was available for them. The draft chart currently uses two vertical scales. This makes the lines look as though they changed together, even though they measure different things. For the final version, show the totals in one chart and the rate per working hour in a separate chart. Include a brief note explaining that a change in the mixture of tasks may affect the comparison. If we cannot obtain the working hours before the briefing, we should still report the counts, but we must say that the productivity comparison is incomplete. The manager has asked for a clear account of what the evidence supports. She has not asked us to make the strongest possible claim about improved performance.