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Part 3 · Chapter 8

Aggregates that reconcile

Planned
Invoices · same brief, twice
An invoices panel: the outstanding total does not match the rows below it

Generated. Outstanding reads 84,200 and the badge says twelve invoices, but three rows are listed and they add up to 28,400. “Paid this month” and “Avg days to pay” came from nowhere at all.

The same invoices panel, where the total is the sum of the rows and every state is derived

Derived. Outstanding is the sum of the rows — 22,200 — and the count matches them. The two figures nothing supports are empty, not invented, and status comes from the due date.

Nothing on the right was drawn better — it was specified.
Planned

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