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Effects of Reuse on Quality, Productivity and Economics

Effects of Reuse on Quality, Productivity and Economics. Wayne C. Lim, 1994. Manufacturing Productivity (MP) section of HP Produces software for resource planning Reuse: Started in 1983 Reuse of code, applications, architecture utilities Code in Pascal and SPL.

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Effects of Reuse on Quality, Productivity and Economics

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  1. Effects of Reuse on Quality, Productivity and Economics Wayne C. Lim, 1994

  2. Manufacturing Productivity (MP) section of HP Produces software for resource planning Reuse: Started in 1983 Reuse of code, applications, architecture utilities Code in Pascal and SPL San Diego Technical Graphics Division Produces firmware for plotters and printers Reuse: Started in 1987 Reuse of code in C Two Case Studies

  3. Result: Reuse Assessment • An analytical and diagnostic method to evaluate qualitative and quantitative aspects of reuse is developed. • Data on improved quality, productivity and economics is analyzed.

  4. 1. Quality Improvement • Reuse gave 2-4 times reduction in number of defects. Reasons are: • Defects found in each reuse are accumulated. • Reuse gives incentives to prevent defects earlier. • Cost of prevention may be averaged over a greater number of products.

  5. 2. Productivity • Reuse encourages specialization in areas as use interfaces, etc. • Fewer products are created from scratch. • Reuse can improve maintainability and reduce maintenance costs. • MP experienced 57% increase, STG about 40%.

  6. 3. Time to Market • If reuse used on the critical path of development, time to market is reduced. • STG experienced 42% reduction.

  7. Reuse costs (1) • Includes creating or purchasing • Reuse work products • Libraries • Tools • Reuse process • Integration costs

  8. Reuse costs (2) • Findings show that relative cost of producing a reusable work product is 120-480 percent higher due to: • time to required to understand the multiple contexts in which the product is used. • More complex design • Integration cost of about 20%.

  9. Net-present-value method • Take the estimated value of reuse benefits and subtract the associated costs, taking into account the time value of the money. • MP found that the break-even (recover costs) point occurs in the second year. Return on investment was 422% over 8 years. • STG found the break-even point in the sixth year, return on investment 216%.

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