Chapter 13 – Cost Planning for the Product Life Cycle: Target Costing, Theory of Constraints, and Strategic Pricing
a. Identify the constraint. The management accountant works with manufacturing managers to
identify any constraint on then process by developing a flow diagram. The diagram shows the
sequence of processes and the amount of time each requires.
b. Determine the most profitable product mix given the constraint. To determine the most profitable
product mix, we first determine the most profitable product, given the constraint. TOC measures
product profitability using the throughput margin, which is the product price less materials cost
(includes the costs of all materials used, purchased components, and materials-handling costs).
c. Maximize the flow through the constraint. Management looks for ways to speed the flow through
the constraint by simplifying the process or improving the product design. An important tool for
managing product flow is the drum-buffer-rope (DBR) system, which is a system for balancing the
flow of production through a constraint. In a DBR system, all productions flows are synchronized to
the drum (the constraint). The rope is the sequence of processes prior to and including the constraint.
The objective is to balance the flow of production through the rope by carefully timing and
scheduling activities. The buffer is a minimum amount of work-in-process input to the constraint to
ensure it is kept busy.
d. Add capacity to the constraint. As a longer-term measure to relieve the constraint and improve
cycle time, management should consider adding capacity to the constraints by adding new or
improved machines and/or additional labor.
e. Redesign the manufacturing process for flexibility and fast cycle time. The most complete
strategic response to the constraint is to redesign the manufacturing process, including the
introduction of new manufacturing technology, deletion of difficult-to-manufacture products, and
redesign some products for greater ease of manufacturing.
2. Theory of Constraints Reports. When a firm focuses on improving cycle time, eliminating
constraints, and improving speed of delivery, the performance evaluation measures also focus on these
CSFs. A common approach is to report throughput margin as well as selected data in a theory of
constraints report. TOC reports are useful for identifying the most profitable product and for monitoring
success in achieving the CSFs.
3. ABC and the Theory of Constraints. ABC is also used to assess the profitability of products.
However, TOC takes a short-term approach to profitability analysis, while ABC costing develops a long-
term analysis. TOC analysis is short term because of its emphasis only on materials-related costs, but
ABC includes all product costs. ABC and TOC are complementary methods; ABC provides a
comprehensive analysis of cost drivers and accurate unit costs as a basis for strategic decisions about
long-term pricing and product profitability analysis. In contrast, TOC provides a useful method for
improving the short-term profitability of the manufacturing plant through short-term product mix
adjustments and through attention to production constraints.
C. Life-Cycle Costing. Life-cycle costing provides a long-term perspective because it considers the
entire cost life cycle of the product or service. Therefore, it provides a more complete view of product
costs and profitability. Total costs over a product’s life cycle are often broken down into three
components: upstream costs (R&D, testing, engineering); manufacturing costs (purchasing, direct and
indirect manufacturing costs); and downstream costs (marketing, distribution, service, and warranty).
Upstream and downstream costs are managed in a number of ways including improved relationships with
suppliers and distributors; the most crucial way is the design of the product and the manufacturing
process.
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Education.