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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
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
basic logic patterns for arrow diagrams
Basic Logic Patterns for Arrow Diagrams

Event

Activity

i

j

(a) Basic Activity

basic logic patterns for arrow diagrams cont
Basic Logic Patterns for Arrow Diagrams (cont.)

A

B

2

4

10

12

(b) Independent Activities

A

B

3

6

9

(c) Dependent Activities

basic logic patterns for arrow diagrams cont4
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

basic logic patterns for arrow diagrams cont5
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

the use of dummy to maintain unique numbering of activities
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

the use of dummy to maintain unique numbering of activities cont
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

removal of redundant dummies
Removal of Redundant Dummies

Original Diagram

Diagram after removal of redundant dummies

A

B

A

B

(a)

A

B

A

B

(b)

C

C

removal of redundant dummies cont
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

combining beginning and ending nodes cont
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

basic rules of network logic
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”.)

basic rules of network logic cont
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).

initial activity list remodeling chemical laboratory
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
preliminary activity list remodeling chemical laboratory
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
activity list with dependencies remodeling chemical laboratory
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

retailing wall arrow diagram start event approach
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