To improve an occupant support sometimes providing occupant's skin or other soft tissues with shear.

A bed includes a frame having with at least one orientation adjustable section (44, 46 and 48) and a mattress supported by the frame and having at least one A bladder and at least one B bladder. The bladders are inflatable and deflatable out of phase with each other in coordination with at least one of (a) issuance of a command for the frame section to change orientation and (b) an actual change in orientation of the frame section. There is a method relating to operation of an occupant/support at least part of which is orientation adjustable relative to other parts of the occupant support. The method, according to a change of orientation of the orientation adjustable part, provides a location A with a relatively lower occupant/support interface pressure (OSIP) and a location B with a relatively higher OSIP and followingly provides the location A with a relatively higher OSIP and the location B with a relatively lower OSIP.