You mean something like:
Moving without floorplans:
- the teams should agree to clear all rooms either clockwise or counter-clockwise; this may be decided on the run
(clockwise means basically starting at the entry point always stick to the left wall clearing all doors/opening until you reached the entry point again)
- usually it’s works better to clear from top to bottom (remember the clearing of stairs!)
In general you should try to stick to the perimeter while moving through open area, this reduces the number/size of danger zones.