Dwell looks simple on a board until a coordinator asks whether the clock starts at gate-in, bay assignment, or seal check. On Thai desks serving mixed domestic and cross-border freight, that ambiguity turns the scorecard into an argument rather than a shared picture.
Start from the physical sequence your yard actually uses. If Seekan-bound trailers often queue outside the compound before paperwork clears, a gate-in clock will punish the desk for traffic the coordinator cannot clear. Many Don Mueang teams instead mark dwell from bay assignment, then track gate-in separately as a yard constraint note — not as a coordinator score.
Agree the cut-off with the people who write the trip sheet. A measure that only the analyst understands will be ignored during Friday peak. Write the definition on the board itself in the same language used at handover.
Retire measures that never change a decision. If dwell red flags always end with “carrier delayed at previous stop,” the board is recording noise. Replace that cell with exception codes the desk already uses on the radio.
Pilot for two weeks before locking the layout. Coordinators should be able to update the board in under five minutes at shift change. If update time stretches past that, the measure set is still too heavy for live work.