This document provides an introduction to cost accounting. It defines cost accounting as the application of accounting principles and techniques to determine and analyze costs. It discusses the meaning of cost for common people versus its technical definition. The key purposes of cost accounting are then outlined as determining and controlling costs, providing information for decision making, and ascertaining profit. Important aspects of cost accounting like classification of costs and cost control are also mentioned. The document compares financial and cost accounting and highlights their differences. It concludes by listing some limitations of cost accounting such as more paperwork, potential unreliability, expense, and it sometimes being unnecessary.