The document discusses process costing and how costs flow through multiple departments in a manufacturing process. It provides examples of calculating equivalent units of production and allocating material and conversion costs per equivalent unit. Specifically, it explains how to determine beginning, started/completed, and ending units based on percentage of completion. It then shows how to calculate a cost per equivalent unit for both materials and conversion costs, and allocate those costs to the different unit categories. This allows tracking the total costs incurred and transferred through each stage of the manufacturing process.