The problem of dynamical decision making is considered here. The syste
m approach to the problem is developed. The notions of decision making
system and its structure are introduced in accordance with this appro
ach. Three main parts can be singled out within the structure: base, e
nvelope and deciser. The nation of base completeness is introduced. Su
fficient conditions of completeness are obtained. Different Variants o
f complete bases depending on uncertainty conditions are considered. T
he corresponding methods of optimal decision making are obtained.