Book excerpt: The Thinker’s Guide to Clinical Reasoning introduces healthcare students and professionals to the foundations of critical thinking and offers examples of applications within clinical fields. It is not enough for healthcare workers to have access to data and research, they must also know how to analyze and process information to guide patients in making the best decisions about their health. This process requires critical thinking skills often ignored in healthcare curricula. As part of the Thinker’s Guide Library, this book advances the mission of the Foundation for Critical Thinking to promote fairminded critical societies through cultivating essential intellectual abilities and virtues across every field of study across world.