Precedence Networks - Construction Project Scheduling and Control - page 121

15. Repeat exercise 12 using contiguous activities.
16. Prove that using interruptible activities in the following project allows the project
to finish 5 days earlier than if the activities were contiguous.

Type Rel a

Activity Duration IPA g S F S F F FF

A 7 -

B 6 A SS 3

A FF 4

C 2 B SS 1

B FF

D 6 C SS

C FF 4

E 10 D SS 3

D FF 2

a If the relationship type is not mentioned, it is finish to start (FS). If no lag is mentioned, it is zero.

17. Give real-life (not necessarily construction) examples for the following:

a. An SS (start-to-start) relationship without lag. No FF (finish-to-finish) rela-
tionship is required.
b. An SS relationship with lag. No FF relationship is required.
c. An SS and FF combination relationship
d. An FF relationship, with or without lag

18. A subcontractor must do the following:

a. Framing (5 days)
b. Drywall installation (4 days)
c. Drywall finish and paint (3 days)
Assuming he wants to make sure each activity finishes as least 1 day after its
predecessor has finished, draw these three activities in a precedence diagram
and calculate how much time the subcontractor would need to finish all three
activities.

19. Look at your solution to the previous exercise. Is it a unique solution, or can you
achieve the same result with different logic?
20. Give an example for each of the following:

a. Start-restricted float
b. Finish-restricted float
c. Double-restricted float
d. Unrestricted float