The weekly demo habit that keeps projects on track

Week three of a project, a client clicked into a checkout flow we'd marked "done" in the sprint board and immediately hit a case we hadn't considered: a customer changing their cart currency mid-checkout. Nothing in the spec covered it. It took an afternoon to fix. Found on week eleven, in front of real users, it would have taken a week and cost a launch date. That's the entire argument for the habit we never break: every Friday at 4pm, a real, clickable build link, not a status slide. Status reports lie by omission. A green checkmark next to "checkout flow" tells you the ticket is closed; it tells you nothing about whether the flow actually works for a real, messy, midway-through-typing-their-card-number user. A working build doesn't have that gap — either the currency switch breaks, or it doesn't, and you find out in week three. It changes the client relationship too. Board updates stop needing slide prep, because the update is a link. And scope conversations happen in real time, against the actual product, instead of in a meeting three weeks after the decision would have mattered.