Main idea

Once two distinct ideas are in place — the data-entry constraint at the dock degrades the information collected; accounting needs structured receipts — what remains is to name what putting them side by side reveals. You write one more idea, which replaces neither of the two: the quality of a receipt depends on a tension between the effort asked of the dock and the structure accounting needs.

This is not a diplomatic average. "Simplify while making the data reliable" tried to make the conflict disappear; this sentence puts it at the center. It shifts the question: it is no longer about simplifying or making the data reliable, but about finding which information must be entered at the dock, and which can be entered elsewhere or later.

Why it matters

The right design question did not exist as long as we were smoothing things over. Writing the tension as an idea gives it equal standing with the other two: it can be cited, linked, taken up again, instead of being an unease everyone feels without putting it into words.

Nuances and limits

Not every pair of opposing ideas produces a fruitful tension; some are in opposition because one of them is false. The tension is only written if both sources are judged true at the same time.

Open questions

• How do you tell a real tension between two needs from a contradiction that comes from a misunderstood source?