Page 289 - The Handbook for Quality Management a Complete Guide to Operational Excellence

276 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 277

1 Start

Excavate (2 days)

2

Foundation (4 days)

3

Rough wall (10 days)

4 Roof (6 days)
Rough exterior
plumbing (4 days)
Rough 6
electrical
work 5 Dummy (0 days) Exterior siding (7 days)
(7 days)
Rough interior
plumbing (5 days)
8
7
Exterior painting (9 days)
Wall board (8 days)
10
Flooring Interior painting
(4 days) 9 (5 days)
Exterior fixtures (2 days)
11 12
Dummy
(0 days) Interior 13
fixtures
(6 days)
Figure 13.7 Network diagram for constructing a house.

precede the roof. The network diagram graphically displays the prece­
dence relationships involved in constructing a house. A PERT network
for constructing a house is shown in Fig. 13.7. (Incidentally, the figure is
also an arrow diagram.)
Finding the Critical Path
There are two time­values of interest for each event: its earliest time of com-
pletion and its latest time of completion. The earliest time for a given event
is the estimated time at which the event will occur if the preceding activ­
ities are started as early as possible. The latest time for an event is the

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