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Operations Management

Operations Management. Module E – Learning Curves. PowerPoint presentation to accompany Heizer/Render Principles of Operations Management, 7e Operations Management, 9e. Outline. Learning Curves in Services and Manufacturing Applying the Learning Curve Arithmetic Approach

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Operations Management

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  1. Operations Management Module E – Learning Curves PowerPoint presentation to accompany Heizer/Render Principles of Operations Management, 7e Operations Management, 9e

  2. Outline • Learning Curves in Services and Manufacturing • Applying the Learning Curve • Arithmetic Approach • Logarithmic Approach • Learning-Curve Coefficient Approach • Strategic Implications of Learning Curves • Limitations of Learning Curves

  3. Learning Objectives When you complete this module you should be able to: Define a learning curve Use the arithmetic concept to estimate times Compute learning curve effects with the logarithmic and learning-curve coefficient approaches Describe the strategic implications of learning curves

  4. Learning Curves • Based on the premise that people and organizations become better at their tasks as the tasks are repeated • Time to produce a unit decreases as more units are produced • Learning curves typically follow a negative exponential distribution • The rate of improvement decreases over time

  5. Cost/time per repetition 0 Number of repetitions (volume) Learning Curve Effect Figure E.1

  6. Learning Curves T x Ln = Time required for the nth unit where T = unit cost or unit time of the first unit L = learning curve rate n = number of times T is doubled First unit takes 10 labor-hours 70% learning curve is present Fourth unit will require doubling twice — 1 to 2 to 4 Hours required for unit 4 = 10 x (.7)2 = 4.9 hours

  7. Learning Curve Examples Table E.1

  8. Learning Curve Examples Table E.1

  9. Uses of Learning Curves Internal: labor forecasting, scheduling, establishing costs and budgets External: supply chain negotiations Strategic: evaluation of company and industry performance, including costs and pricing

  10. Arithmetic Approach • Simplest approach • Labor cost declines at a constant rate, the learning rate, as production doubles

  11. Logarithmic Approach Determine labor for any unit, TN , by TN = T1(Nb) where TN = time for the Nth unit T1 = hours to produce the first unit b = (log of the learning rate)/(log 2) = slope of the learning curve

  12. Logarithmic Approach Determine labor for any unit, TN , by TN = T1(Nb) where TN = time for the Nth unit T1 = hours to produce the first unit b = (log of the learning rate)/(log 2) = slope of the learning curve Table E.2

  13. Logarithmic Example Learning rate = 80% First unit took 100 hours TN = T1(Nb) T3 = (100 hours)(3b) = (100)(3log .8/log 2) = (100)(3–.322) = 70.2 labor hours

  14. Coefficient Approach TN = T1C where TN = number of labor-hours required to produce the Nth unit T1 = jumlah jam kerja yang dibutuhkanuntukmemproduksi unit pertama C = Coefficient kurvabelajarsptditampilan di tabel E.3

  15. 70% 85% Unit Number (N) Unit Time Total Time Unit Time Total Time 1 1.000 1.000 1.000 1.000 2 .700 1.700 .850 1.850 3 .568 2.268 .773 2.623 4 .490 2.758 .723 3.345 5 .437 3.195 .686 4.031 10 .306 4.932 .583 7.116 15 .248 6.274 .530 9.861 20 .214 7.407 .495 12.402 Learning-Curve Coefficients Table E.3

  16. 70% 80% Unit Number (N) Unit Time Total Time Unit Time Total Time 1 1.000 1.000 1.000 1.000 2 .700 1.700 .800 1.800 3 .568 2.268 .702 2.502 4 .490 2.758 .640 3.142 8 .512 5.346 10 .306 4.932 .477 6.315 15 .248 6.274 .418 8.511 20 .214 7.407 .381 10.485 Learning-Curve Coefficients Table E.3

  17. Coefficient Example First boat required 125,000 hours Labor cost = $40/hour Learning factor = 85% TN = T1C T4 = (125,000 hours)(.723) = 90,375 hours for the 4th boat 90,375 hours x $40/hour = $3,615,000 TN = T1C T4 = (125,000 hours)(3.345) = 418,125 hours for all four boats

  18. 100,000 .773 = 129,366 hours Coefficient Example Third boat required 100,000 hours Learning factor = 85% New estimate for the first boat

  19. Strategic Implications To pursue a strategy of a steeper curve than the rest of the industry, a firm can: Follow an aggressive pricing policy Focus on continuing cost reduction and productivity improvement Build on shared experience Keep capacity ahead of demand

  20. Industry price Company cost (c) Price per unit (log scale) Loss (b) (a) Gross profit margin Accumulated volume (log scale) Industry and Company Learning Curves Figure E.2

  21. Limitations of Learning Curves • Learning curves differ from company to company as well as industry to industry so estimates should be developed for each organization • Learning curves are often based on time estimates which must be accurate and should be reevaluated when appropriate

  22. SEKIAN

  23. Limitations of Learning Curves • Any changes in personnel, design, or procedure can be expected to alter the learning curve • Learning curves do not always apply to indirect labor or material • The culture of the workplace, resource availability, and changes in the process may alter the learning curve

  24. Dibutuhkanwaktu 28.718 jam untukmenyelesaikanlokomotifkedelapanpadasebuahperusahaanmanufaktur. Jikafaktorpembelajaranadalah 80% berapa lama yang dibutuhkanuntukmemproduksilokomotifkesepuluh. Dan berapa total biayauntukmemproduksi 10 lokomotifjikaupahperjam US$ 20

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