This document provides an overview of chapter 1 of a cost accounting course. It defines key concepts such as cost, cost accounting, and cost accountancy. Cost is defined as the actual or nominal expenditure incurred on or attributable to a specified thing or activity. Cost accounting is the process of accounting for costs from when expenditure is incurred until it is related to cost centers or units. Cost accountancy applies costing and cost accounting principles and techniques to ascertain profitability and present relevant information for managerial decision making. The document explains the differences between costing, cost accounting, and cost accountancy in terms of their scope, functions, periodicity, and persons involved.