We propose a new method for decision making: adaptive decision making by logical reasoning based on various relevant logics. The basic idea of our adoptive decision making method is to explicitly separate the underlying logic system, reasoning/computing mechanism, and empirical knowledge in any decision making process such that both underlying logic system and empirical knowledge can be revised/replaced in various decision making processes performed by an area-independent, task-independent, general-purpose reasoning mechanism. We also show that the new method can work well only if we adopt various logics constructed based on strong relevant logics as the underlying logic systems.