The reality around us constantly demonstrates physical and social processes in which the interests of the participants are not diametrically opposed, though they by no means always coincide. The study of such processes (interesting in itw own right) is essential for working out ways of making decisions, that is, for choosing among available parameters of the processes. If, in view of certain considerations, a participant i h 1 f 0 h' . b c ooses a va ue Xi 0 a parameter Xi' s act on can e formally described as an attempt to maximize the function f. = -llx. - x ll. For this reason any decision...