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TYPES OF ACTIVITIES

TYPES OF ACTIVITIES 1. Production Activities Those that can be taken directly from plans and specifications 2. Procurement Activities procurement of material and equipment 3. Management Decision Activities Activities that can be created by management to avoid certain situations

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TYPES OF ACTIVITIES

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  1. TYPES OF ACTIVITIES 1. Production Activities Those that can be taken directly from plans and specifications 2. Procurement Activities procurement of material and equipment 3. Management Decision Activities Activities that can be created by management to avoid certain situations • Delay Concrete • Company Vacation

  2. Basic Logic Patterns for Arrow Diagrams Event Activity i j (a) Basic Activity

  3. Basic Logic Patterns for Arrow Diagrams (cont.) A B 2 4 10 12 (b) Independent Activities A B 3 6 9 (c) Dependent Activities

  4. Basic Logic Patterns for Arrow Diagrams (cont.) 4 A C 6 8 B 2 Activity C depends upon the completion of both Activities A & B (d) A Merge 6 B A 2 4 C 8 Activities B and C both depend upon the completion of Activity A (e) A Burst

  5. Basic Logic Patterns for Arrow Diagrams (cont.) 12 18 A C 16 D B 14 20 Activities C and D both depend upon the completion of Activities A and B (f) A Cross

  6. The use of dummy to maintain unique numbering of activities 2 8 A C Divide node to correct 6 D B 4 10 (a) Incorrect Representation A C 2 6 8 Dummy B D 4 5 10 (b) Correct Representation

  7. The use of dummy to maintain unique numbering of activities (cont.) A Divide node to correct 4 10 B (a) Incorrect Representation A 4 10 B Dummy 11 (b) Correct Representation

  8. Removal of Redundant Dummies Original Diagram Diagram after removal of redundant dummies A B A B (a) A B A B (b) C C

  9. Removal of Redundant Dummies (cont.) Original Diagram Diagram after removal of redundant dummies A C (c) A C B E B E A C A C (d) B E B E

  10. Combining Beginningand Ending Nodes A C E B F

  11. Combining Beginning and Ending Nodes (cont.) A E 2 8 12 B 4 14 C F 6 10 16 (a) Incorrect Representation 8 2 16 10 (b) Correct Representation

  12. Basic Rules of Network Logic Rule 1. Before an activity may begin, all activities preceding it must be completed. (Activities with no predecessors are self-actuating when the project begins.) Rule 2. Arrows imply logical precedence only. Neither the length of the arrow nor its “compass” direction on the drawing have any significance. (An exception to this rule is discussed under “Time-scaled Networks”.)

  13. Basic Rules of Network Logic (cont.) Rule 3. Event numbers must not be duplicated in a network. Rule 4. Any two events may be directly connected by more than one activity. Rule 5. Networks may have only one initial event (with no predecessor) and only one terminal event (with no successor).

  14. Initial Activity List -Remodeling Chemical Laboratory • Activity list • Strip room • Repair floor • Lay vinyl floor • Rough-in plumbing and electrical • Finish plumbing and electrical • Replace existing fume duct • Install new fume hood • Install base cabinets • Instal wall cabinets • Install chemical sink • Paint cabinets • Paint walls and ceiling

  15. Activity List Strip room repair walls and ceilings Repair floor lay vinyl floor rough-in plumbing and electrical finish plumbing and electrical replace existing fume duct install new fume hood install base cabinets instal wall cabinets install chemical sink paint cabinets paint walls and ceiling obtain vinyl floor covering obtain cabinets obtain fume hood obtain chemical sink painter availability Preliminary Activity List - Remodeling Chemical Laboratory

  16. Activity List with Dependencies - Remodeling Chemical Laboratory No. Activity list Depends Upon 1 Strip room — 2 Repair walls and ceilings 1,5,7 3 Repair floor 1,5 4 Lay vinyl floor 3,12,13,14 5 Rough-in plumbing and electrical 1 6 Finish plumbing and electrical 2,3,5,9,10,11,19 7 Replace existing fume duct 1 8 Install new fume hood 2,3,16 9 Install base cabinets 2,3,8,15 10 Instal wall cabinets 2,3,7,15 11 Install chemical sink 2,3,5,9,17 12 Paint cabinets 6,8,9,10,11,18 13 Paint walls and ceiling 2,3,6,8,9,10,18 14 Obtain vinyl floor covering — 15 Obtain cabinets — 16 Obtain fume hood — 17 Obtain chemical sink — 18 Painter availability — 19 Install 2/3 base cabinet 2,3,9,15

  17. Retailing wall arrow diagram - start event approach (b) (a) Footing 1 Footing 1 Wall 2 Wall 1 (c) Wall 1 Footing 1 Footing 1 Wall 2 Footing 2 Wall 1 Footing 1 (d) Footing 1 Footing 1 Wall 2 2 4 8 10 Wall 1 6

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