Human communication can be characterized in terms of game theory as competing motivations in a social game in which one person desires "winning" in terms of obtaining compliance. Furthermore, game theory is an interesting framework for dialogue modeling, both the human dialogue and the human-machine dialogue. The first chapter describes the author's contribution on the pragmatics of the dialogue, and proposes a general model of dialogue based on game theory. The second and third chapters review game theory as a way to analyze many different kinds of decisions and decision problems. The remaining chapters present a methodology based on Decision Analysis; decisions in everyday statistics; and an analysis of Thomas Bayes' famous "Essay towards Solving a Problem in the Doctrine of Chances".