This document discusses different costing methods that can help management make better decisions. It explains that a costing system establishes the costs of activities and products based on past and estimated future costs. This allows a firm to understand profitability, compare actual vs estimated costs, and set appropriate prices. The document outlines different types of costs like direct, indirect, fixed and variable costs. It also explains methods for allocating indirect costs through apportionment and absorption costing using predetermined overhead rates. Marginal costing is also discussed as providing better information for planning by treating fixed costs as period costs.