A control circuit stores a plurality of radiation treatment plan states as pertain to optimization of a given radiation treatment plan. The control circuit detects a user's selection of a particular one of the plurality of radiation treatment plan states and responsively displays dose distribution information as corresponds to that selected state. The control circuit can automatically store at least some of those states and/or can provide the user with an opportunity to selectively save a particular state. The control circuit can provide the user with an opportunity to modify optimization objectives such that at least two of the states correspond to different optimization objectives for the radiation treatment plan. The control circuit can also display a radiation treatment plan state selector to facilitate the user selecting the particular state. An individual selector for each state can provide a visual indication of merit as pertains to each such state.