#### Summary

In this first Learning Path on Game theory, we learn about the main tools and conditions required in order to make a thorough analysis of games. We see how the quality of information shape the way we solve games, and learn about how to describe them.The perfection of information is an important notion in *game theory* when considering *sequential* and *simultaneous games*. It is a key concept when analysing the possibility of punishment strategies in *collusion* agreements.

Perfect information refers to the fact that each player has the same information that would be available at the end of the game. This is, each player knows or can see other player’s moves. A good example would be chess, where ech player sees the other player’s pieces on the board.

Imperfect information appears when decisions have to be made simultaneously, and players need to balance all possible outcomes when making a decision. A good example of imperfect information games is a card game where each player’s card are hidden from the rest of the players.