Notes on delivery,estimates and the account of time.
Deliveries do not fail at the deadline. They fail at the estimate.
Every delivery is a promise between two parties: this, by then, for that. The promise is signed on a guess, and found to be broken at the deadline.
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Why a forecast should be a range, never a date
A single date pretends to know more than anyone does. A range says what is known, and narrows as the delivery is measured.
Why Retival is priced by the delivery, never by the seat
An instrument whose income rose with the outcome would be a party to the delivery. So the price is fixed at the signed baseline.
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