Project Management Systems Activity Duration and Predecessor Information

In this homework you be working through four Activity In Box (AIB) problems. Using the activity, duration, and predecessor information given in this document, you should first construct a network for each "project." [Each problem will have its own network.]

Once you have constructed the networks, you will log into the “Homework Exam" in Week 4 and input the answers to the homework questions.

Problem 1

The following data were obtained from a project to create a new portable electronic.

Activity Duration Predecessors
A 3 Days ---
B 4 Days ---
C 6 Days ---
D 2 Days A, B
E 1 Days C
F 3 Days D
G 3 Days E, F
H 7 Days D
I 10 Days G

Construct a network for the project. Then review and answer the multi-part question found on the Homework tab in Week 4.

Question
(A.) What is the Scheduled Completion of the Project? [2 points]
(B.) What is the Critical Path of the Project? [3 points]
(C.) What is the EST for Activity D? [2 points]
(D.) What is the LST for Activity G? [2 points]
(E.) What is the EF for Activity B? [2 points]
(F.) What is the LF for Activity H? [2 points]
(G.) What is the float for Activity I? [2 points] (Points: 15)

Answer:
A. 22 days
B. B, D, F, G, I
C. EST = 4
D. LST = 9
E. EF = 4
F. LF = 22
G. Float = 0

Problem 2

The following data were obtained from a project to build a pressure vessel:

Activity Duration Predecessors
A 4 weeks ---
B 4 weeks ---
C 3 weeks B
D 2 weeks A, C
E 3 weeks B
F 5 weeks D, E, G
G 2 weeks B
H 6 weeks F
I 3 weeks G
J 1 week I

Construct a network for the project. Then review and answer the multi-part question found on the Homework tab in Week 4.

Question:
(A.) Calculate the scheduled completion time and identify the critical path. [7 points]
(B.) What is the slack time (float) for activities A, D, E, and G? [8 points] (Points: 15)

Answer:
A. 20 weeks / critical path is B, C, E, D, F, H
B. Float time for A 7-4 = 3
Float time for D