Tyler company manufactures roller blade and skateboard wheels that it sells to manufactures and retail outlets. Manufacturing consists of two processes: machining and assembly. Machining department shapes, hones, and drills the raw materials. The assembly department assembles and packages the parts. Abc: key concepts activity based costing = abc. Identify overhead cost pools and drivers, assign overhead to production using abc methods. Activity any event, action, transaction, or work sequence that incurs costs when producing a product or performing a service. Activity cost pool the oh cost attributed to a distinct activity. Ordering materials setting up machines, assembling products and inspecting products. Cost driver any factor or activity that has a direct cause effect relationship with the resources consumed. Overhead costs - activity cost pools - cost drivers - products. Cvp & relevant costing 16 questions on the oa. Variable costs: costs that vary in total directly and proportionately with changes in the activity level.