Life skills are those skills that enable individuals to effectively face the demands and challenges of daily life.Among these, critical thinking is one of the fundamental requisites for the emancipation and participation in the social life of every human being. But what do we actually mean when we talk about critical thinking? Is it possible to think of building tools for the development and evaluation of critical thinking? The volume intends to answer these questions through theoretical and operational material. This is a hands-on book focused on developing your intelligence and critical thinking skills to make decisions. This is not an abstract story about thinking and I assure you that after reading it you will not be the same person who is reading these words. With the critical thinking tools and strategies that I will teach you in this book, you will learn not to be deceived by cunning techniques of argumentation, to be sane, to strive to understand and appreciate the points of view of others, to analyze the reasoning with which you do not necessarily agree and change your points of view when you are faced with a better reasoning.