Network Diagram Excercises

Exercise 1
[AON] Using the table below, draw the network diagram and answer the questions. When you have completed answering the questions, do a forward/backward pass.

Activity
Start C B P A U T R N End

Predecessor
Start Start Start C, B, P P A A U T, R, N

Estimate in weeks 0
6 4 3 7 4 2 3 6 0

. How many paths are in the network, and what are they?

2. What is the critical path and its duration?

3. What is the float on activity U?

4. What is the impact to the project if activity B takes three weeks longer than planned?

Do a forward and backward pass using the original estimates.



Answer to Exercise 1
[AON] Using the table below, draw the network diagram and answer the questions. When you have completed answering the questions, do a forward/backward pass.

Activity
Start C B P A U T R N End

Predecessor
Start Start Start C, B, P P A A U T, R, N

Estimate in weeks 0
6 4 3 7 4 2 3 6 0

C

A

T

Start

B

R

End

P

U

N

. How many paths are in the network, and what are they? There are seven paths. See the details on the next page.

2. What is the critical path and its duration? Start, C, A, R, End 16 WEEKS

3. What is the float on activity U? 3 weeks 4. What is the impact to the project if activity B takes three weeks longer than planned? Critical path shifts to Start, B, A, R, End. It will delay the project end by one week.

Do a forward and backward pass using the original estimates.

2

Answer to Exercise 1
Note: Answers are based on using the zero method. See www.rmcproject.com/free/tips.htm for an explanation of the two methods.

6 C 0 0 0 4 Start 0 2 B 2 3 P 0 3 3 3 6 3 6 4 6 4 U 3 6 6 6 6

7 A 0 13 13 13 14 3 R 13 13 0

2 T 1 15 16

End 16 16

N 7 10 7 10 3 13 16

Legend D ID ES EF S LS LF

Start, C, A, T, End Start, C, A, R, End Start, B, A, T, End Start, B, A, R, End Start, P, A, T, End Start, P, A, R, End Start, P, U, N, End

5 6 3 4 2 3