This document defines key cost accounting terms and concepts. It discusses the objectives of cost accounting like ascertaining costs, determining selling prices, and assisting management decision making. It distinguishes between cost reduction and cost control and highlights their differences. The importance of cost accounting to businesses is outlined for decision making, cost control, budgeting, efficiency measurement, and price determination. Financial accounting is distinguished from cost accounting. Finally, it describes different bases for classifying costs like functions, controllability, normality, and relevance for decision making.