“Key Terms A list of the most common terms you’ll encounter in this book ARGUMENT A set of statements (premises) that are given to advance a conclusion. AUDIENCE The people listening to the argument, those to whom the argument is directed. COMMITMENT A proposition that a proponent takes to be true, either implicitly or explicitly. CONCLUSION A statement that follows from the preceding statements (the argument). CONDITIONAL A statement of the form ‘if A, then B,’ where A cannot be true and B false. DEDUCTIVE ARGUMENT An argument whose conclusion follows logically from its premises. FALLACY The use of invalid reasoning in an argument. INDUCTIVE ARGUMENT An argument whose premises give good evidence for its conclusion (e.g., inferring a general law from particular examples of it). INVALID An argument is invalid only when it is not valid. LOGIC The principles and rules that govern valid inferences. MODAL A type of statement that deals with necessity, possibility or impossibility. OPPONENT A person attempting to rebut an argument. PRESUPPOSITION A proposition which an argument, or a proponent, takes for granted. PROPONENT The person putting forward an argument. SAMPLE A subset of a population, studied to make extrapolations that apply to the population as a whole. SOUND An argument is sound only when it is valid and its premises are true. VALID An argument is valid if and only if its premises cannot be true when its conclusion is false. P1,2, ETC.”