Designer Alex's firm shares forty drawings with the other teams. Every one is ticked as checked. By the same person. In four minutes.
Checked, actually
The back alley's bill so far: 77 weeks · See the bill
Alex made me on Friday. Before anyone outside the team sees me, someone who didn't draw me has to look properly. Not a tick. A look.
The wrong way
042 is one of the forty. Its drain clips the edge of a foundation. Nobody looked, so nobody saw.
The other teams start building their work around the forty. Why wouldn't they? Every one says checked.
The gang digs the drain run to 042. The digger bucket finds the foundation the drawing walked straight through.
Sam, the firm's information manager, takes the drawing to Alex.
Sam: Who checked this?
Alex: It says checked.
The drain is redesigned, and the trench is dug again.
Sam: That's not what I asked.
Forty drawings, forty ticks, four minutes, and a digger that found the foundation the hard way.
+3 weeks on the back alley's bill: A tick instead of a check: a drain redesigned and re-dug in month five.