Page 288 - The Handbook for Quality Management a Complete Guide to Operational Excellence

274 C o n t i n u o u s I m p r o v e m e n t D e f i n e S t a g e 275

Incorrect: Violates rule #2
Activity #1
Head event Tail event
Activity #2

Solution: Add dummy event and activity

Dummy event
Activity #1

Head event Dummy activity

Activity #2 Tail event

Figure 13.6 Parallel activities: network representation.

The data shown in Table 13.2 consist of the activities and their esti­
mated completion times for constructing a house.
Now, it is important that certain of these activities be done in a par­
ticular order. For example, one cannot put on the roof until the walls are
built. This is called a precedence relationship; that is, the walls must

Activity Time to Complete (days)
Excavate 2
Foundation 4
Rough wall 10
Rough electrical work 7
Rough exterior plumbing 4
Rough interior plumbing 5
Wall board 5
Flooring 4
Interior painting 5
Interior fixtures 6
Roof 6
Exterior siding 7
Exterior painting 9
Exterior fixtures 2

From Hillier and Lieberman (1980)
Table 13.2 Activities Involved in Constructing a House

13_Pyzdek_Ch13_p265-292.indd 275 11/9/12 5:14 PM