Logic is the study of formal and informal reasoning. Originally a branch of philosophy, logic has also become a mathematical discipline, a tool of modern linguistics, the core of computer science and an object of study for psychologists and cognitive scientists of every description. The field now reaches into virtually every aspect of human (and nonhuman) thought. Studying logic enhances students’ reasoning ability, analytic reading and writing skills, oral debate skills, and appreciation of the structure of language and argument and of the structure of abstract formal systems. Logic is an excellent foundation not only for the study of philosophy, mathematics, computer science and linguistics, but also for such disciplines as legal studies, government and economics.