The document discusses concepts related to project scheduling including floats, critical paths, time crashing, and developing a time-cost tradeoff model. It provides information on normal and crash estimates for activities, calculating cost slopes, and sequentially crashing critical activities to determine the minimum total project cost and duration.

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7. Total float: Can change the successor activity times & bring new critical path Free Float: Can delay without any problem. No change in successor activities. Independent Float: Can delay even if the previous activities are late

8. FLOATS : Flexibility in delaying an activity 0

13. Project Cost Components

15. Direct project Cost

16. Variation of Cost with Time

17. Indirect Cost Only considering overheads and supervision

19. Indirect Cost (Overhead + Outage Loss)

20. Total Project Cost

22. Cost Variation with Time

25. Generalized direct cost-time curve

26. Direct Cost Curve

27. Total Project Cost & Optimum Duration Total Cost Curve Linear Approximation

33. 1. Find out the cost slope for each activity ? 2. Find out Normal Duration Direct Cost ?

34. 3. Crash the activity with least cost slope ? 4. Find out the extra cost of crashing ? 5. Add to the normal direct cost of the project

35. 6. Crash another activity ? 7. Find out the extra cost of crashing ? 8. Add to the normal direct cost of the project ?

39. Critical Path

40. Normal Duration & Direct Cost

41. Cost Slope

42. First Stage crashing: Critical Activity with minimum cost -slope Not 3 weeks: (The path should remain critical)

43. Second-Stage crashing 2-3, 2-4 or 2-4, 3-4. minimum cost slope Simultaneously

44. Third Stage of Crashing: Activity 2-4 & 3-4

45. Fourth Stage of Crashing

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