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INSTRUCTORS RESOURCE MANUAL
CHAPTER NINE
Project Scheduling:
Networks, Duration Estimation, and Critical Path
To Accompany
PROJECT MANAGEMENT:
Achieving Competitive Advantage
ByJeffrey K. Pino
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CHAPTER NINE
PROJEC !OC"S # he S$allation Neutron Source Project
%NROD"C%ON
&'1 PROJEC SC(ED")%N*
&'+ E- SC(ED")%N* ER.%NO)O*-
&'/ DE0E)OP%N* NE2OR
)a3eling Nodes
Serial cti4ities
Concurrent cti4ities
5urst cti4ities
.erge cti4ities&'6 D"R%ON ES%.%ON
&'7 CONSR"C%N* (E CR%%C) P(
Calculating the Network
he !orward Pass
he 5ackward Pass
)addering cti4ities
(ammock cti4ities
Ste$s to Reduce the Critical Path
Project .anagement Research in 5rie8 # So8tware De4elo$ment Dela9s and Solutions
Summar9
e9 erms
Sol4ed Pro3lems
Discussion uestions
Pro3lems
%nternet E;ercises
.SProject E;ercises
P.P Certi8ication Sam$le uestions
5i3liogra$h9
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TRANSPARENCIES
!." RULES #OR $E%ELOPIN& ACTI%IT' NET(ORKS
". Some )eerminaion of aci*iy prece)ence or)erin+ m,- e )one
prior o creain+ /e ne0or1.
2. Ne0or1 )ia+ram- ,-,a33y f3o0 from 3ef o ri+/.
4. An aci*iy canno e+in ,ni3 a33 prece)in+ connece) aci*iie-
/a*e een comp3ee).
5. Arro0- on ne0or1- in)icae prece)ence an) 3o+ica3 f3o0. Arro0-
can cro-- o*er eac/ o/er6 a3/o,+/ i i- /e3pf,3 for c3ariy- -a1e
o 3imi /i- effec 0/en po--i3e.
7. Eac/ aci*iy -/o,3) /a*e a ,ni8,e i)enifier a--ociae) 0i/ i
9n,mer6 3eer6 co)e6 ec.:.
;. Loopin+6 or recyc3in+ /ro,+/ aci*iie-6 i- no permie).
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!.2 LABELS #OR ACTI%IT' NO$E
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Earl9 %D Num3er Earl9
Start !inish
cti4it9 cti4it9 Descri$tor !loat
)ate cti4it9 )ate
Start Duration !inish
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!.4 PROJECT ACTI%ITIES LINKE$ IN SERIES
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!.5 ACTI%ITIES LINKE$ IN PARALLEL 9CONCURRENT:
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!.7 MER&E ACTI%ITIES
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cti4it9
cti4it9 5
cti4it9 C
cti4it9 D
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!.; BURST ACTI%ITIES
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cti4it9 C
cti4it9 5
cti4it9
cti4it9 D
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!.< E>AMPLE O# CREATIN& A PROJECT ACTI%IT'
NET(ORK
Informaion for Ne0or1 Con-r,cion
Name? Pro=ec $e3a
Aci*iy $e-cripion Pre)ece--or-
A Conrac -i+nin+ None
B @,e-ionnaire )e-i+n A
C Tar+e mar1e I$ A
$ S,r*ey -amp3e B6 C
E $e*e3op pre-enaion B
# Ana3ye re-,3- $
& $emo+rap/ic ana3y-i- C
H Pre-enaion o c3ien E6 #6 &
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!. ACTI%IT' NET(ORK #OR E>AMPLE
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Contract
C .arket %D
5
Design
*
Demog'
E De4' Present'
D Sur4e9
! nal9sis
( Present
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!.! ACTI%IT' $URATION ESTIMATION BETA
$ISTRIBUTION
ESTIMATE$ TIME #ORMULA
TE D A 59B: C
;
(HERE?
A D MOST OPTIMISTIC TIME
B D MOST LIKEL' TIME
C D MOST PESSIMISTIC TIME
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!."F CONSTRUCTIN& THE CRITICAL PATH
IN#ORMATION #OR PROJECT $ELTA
Aci*iy $e-cripion Pre)ece--or- E-imae) $,raion
A Conrac -i+nin+ None 7
B @,e-ionnaire )e-i+n A 7
C Tar+e mar1e I$ A ;
$ S,r*ey -amp3e B6 C "4
E $e*e3op pre-enaion B ;
# Ana3ye re-,3- $ 5
& $emo+rap/ic ana3y-i- C !
H Pre-enaion o c3ien E6 #6 & 2
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!."F 9Con):
Paria3 Pro=ec Aci*iy Ne0or1 0i/ Ta-1 $,raion-
Copyright 2010 Pearson Education, Inc. Publishing as Prentice Hall
Contract
7
5Design
7
C
.arket %D
nal9sis6
1? E 1
+> ( /?Presentation
+> + /?
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!."7 COMPLETE$ ACTI%IT' NET(ORK (ITH CRITICAL PATH AN$ ACTI%IT'
SLACK TIMES I$ENTI#IE$
Criica3 Pa/ i- in)icae) in o3)
Copyright 2010 Pearson Education, Inc. Publishing as Prentice Hall
? 7? Contract
? 7 7
7 5 1?
1 Design
< 7 11
7 C 11
? .arket %D7 < 11
11 D +6? Sur4e9
11 1/ +6
11 * +?> Demogra$h'
1& & +>
+6 ! +>? nal9sis
+6 6 +>
1? E 1ERCISES
EGerci-e !."
Consider the 8ollowing in8ormation that 9ou ha4e com$iled regarding the ste$s needed to
com$lete a $roject' -ou ha4e identi8ied all rele4ant ste$s and ha4e made some
determination regarding $redecessorGsuccessor relationshi$s' "sing .SProject, de4elo$
a sim$le Network diagram 8or this $roject, showing the links among the $roject acti4ities'
cti4it9 Predecessors
# Sur4e9 site F
5 # %nstall sewer and storm drainage
C # %nstall gas and electric $ower lines
D # E;ca4ate site 8or s$ec house 5, C
E # Pour 8oundation D
So3,ion?
Entering the acti4ities and assigning the $redecessor relationshi$s using .SProject, the
Network Diagram should resem3le the 8ollowing:
.icroso8t $roduct screen shots re$rinted with $ermission 8rom .icroso8t Cor$oration'
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EGerci-e !.2
Su$$ose we ha4e a com$lete acti4it9 $redecessor ta3le shown 3elow and we wish to
create a Network diagram highlighting the acti4it9 se@uence 8or this $roject' "sing
.SProject, enter the acti4ities and their $redecessors and create a com$lete acti4it9
Network diagram 8or this $roject'
Pro=ec Remo)e3in+ an App3iance
cti4it9 Predecessors
' Conduct com$etiti4e anal9sis F
5' Re4iew 8ield sales re$orts F
C' Conduct tech ca$a3ilities assessment F
D' De4elo$ 8ocus grou$ data , 5, C
E' Conduct tele$hone sur4e9s D
!' %denti89 rele4ant s$eci8ication im$ro4ements E
*' %nter8ace with .arketing sta88 !
(' De4elo$ engineering s$eci8ications *
%' Check and de3ug designs (
J' De4elo$ testing $rotocol *
' %denti89 critical $er8ormance le4els J
)' ssess and modi89 $roduct com$onents %,
.' Conduct ca$a3ilities assessment )
N' %denti89 selection criteria .
O' De4elo$ R! .
P' De4elo$ $roduction master schedule N, O
' )iaison with Sales sta88 P
R' Pre$are $roduct launch
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So3,ion?
Entering the a3o4e 4alues and $redecessor relationshi$s, we would deri4e the 8ollowing network diagram' Note that as in the case o8
E;ercise &'1, without duration estimates, all acti4ities are assumed to 3e o8 similar duration, making e4er9 acti4it9 in the network $art
o8 the critical $ath'
.icroso8t $roduct screen shots re$rinted with $ermission 8rom .icroso8t Cor$oration'
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EGerci-e !.4
Su$$ose that we add some duration estimates to each o8 the acti4ities 8rom e;ercise &'1'
$ortion o8 the re4ised ta3le is shown 3elow' Recreate the Network diagram 8or this
$roject and note how .SProject uses nodes to identi89 acti4it9 durations, start and 8inish
dates, and $redecessors' 2hat is the critical $ath 8or this network diagram (ow do we
know
cti4it9 Duration Predecessors
# Sur4e9 site 7 da9s F
5 # %nstall sewer and storm drainage & da9s
C # %nstall gas and electric $ower lines 6 da9s
D # E;ca4ate site 8or s$ec house + da9s 5, C
E # Pour 8oundation + da9s D
So3,ion?
Entering the a3o4e 4alues and durations, the network diagram would resem3le the
8ollowing' %8 this network were shown on a com$uter screen, 9ou would note that the
critical $ath is highlighted in red, identi89ing the acti4ities # 5 # D # E as l9ing on the
critical $ath'
.icroso8t $roduct screen shots re$rinted with $ermission 8rom .icroso8t Cor$oration'
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