A control circuit accesses machine limitations information and target motion boundary information. The control circuit then combines the machine limitations information with the target motion boundary information when acting with respect to a radiation treatment plan. By one approach the control circuit acts with respect to a radiation treatment plan by presenting machine limitation information in combination with target motion boundary information. As another approach, the control circuit acts by combining the foregoing information while developing the radiation treatment plan to use that information to make automatic adjustments to the radiation treatment plan to correct instances where a planned configuration reveals a conflict between the physical limitations of the treatment platform and the target motion boundary.
