Ordinary language has no exact logic most philosophers agree with Peter Strawson s statement today. In the present volume, Christoph Schamberger proves otherwise. The rules of derivation in everyday life and in philosophy can be described in precise, simple terms. Using numerous examples, Schamberger first examines colloquial conditional sentences and arguments. He then presents a non-classic calculus of natural deduction with which the logical conclusion can be drawn and validated in ordinary language. The final capital comprises a critical discussion of the principle of bivalence, which restricts the applicability of logic to sentences that are either true or false. Readers are required to have only a basic understanding of logic. "Ordinary language has no exact logic" - most philosophers agree with Peter Strawson's statement today. In the present volume, Christoph Schamberger proves otherwise. The rules of derivation in everyday life and in philosophy can be described in precise, simple terms. Using numerous examples, Schamberger first examines colloquial conditional sentences and arguments. He then presents a non-classic calculus of natural deduction with which the logical conclusion can be drawn and validated in ordinary language. The final capital comprises a critical discussion of the principle of bivalence, which restricts the applicability of logic to sentences that are either true or false. Readers are required to have only a basic understanding of logic.