This document discusses job order costing systems. It explains that job order costing accumulates costs for individual jobs or orders and uses a subsidiary ledger to track the costs of each job. It describes how direct materials, direct labor, and overhead costs are recorded for jobs and how journal entries are made to track costs in work in process and finished goods inventory accounts. Finally, it notes that job order costing information is used by management to estimate costs, set prices, develop budgets, compare actual to estimated costs, determine profitable jobs, and manage inventory.