This document defines key terms related to determining the selling price of goods and services. It defines cost as the amount that must be paid to produce something, including expenses from materials, resources, time, and risks. It defines costing as a method to calculate the total cost per unit by including all fixed and variable costs of production. It also defines cost accounting as a process that measures input and production costs to help management assess financial performance. It then provides an overview of direct costs, indirect costs, and the total costs involved in production and sales, and how understanding costs through a cost sheet can help set the optimal selling price.