Classifying zones by access rule before anything else
On a restricted site the access classification determines the schedule more than the floor plan does. Open areas can be worked in any order. Pass-controlled zones depend on credentials being issued and tested. Escorted zones depend on a person being available. Excluded zones are cleaned by client staff or not at all. Writing every area against one of those four categories is the first useful output of the walkthrough.
The categories then drive the sequence. Escorted work is booked into the window the escort can provide and everything else is arranged around it, because it is the least flexible element. Planning the other way round, and treating the escort as something to be arranged when the crew reaches that door, produces a shift where the restricted areas are the ones that consistently get missed.
