"A System of Logic, Ratiocinative and Inductive" by John Stuart Mill is a philosophical work published in 1843. Mill formulates his famous five principles of inductive reasoning, known as Mill's Methods, establishing empirical foundations that would support his broader moral and political philosophies. This influential treatise examines the nature of logic, the structure of propositions, and the methods of scientific investigation. Mill explores how assertions are proved or disproved, positioning induction as the central question of logic itself. The work extends these rigorous methods to the moral sciences, seeking to advance social progress through systematic reasoning.