Basic CPM Updating

8/6/2019 Basic CPM Updating

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Project CPM Scheduling |

BasicCPMUpdating

Whentoupdate?

UnexpectedEvents

UpdateTheScheduleAtTheTimeTheEventOccurs.

ReviewtheUpdate.Analyzeresults.(VarianceandTotalFloat).

MakeaCopyoftheSchedulebeforeediting.

ModifyTheCopywiththeUnexpectedEvent.Recalculate.

ComparetoUpdatedSchedule.Dideventcausecriticalpathimpact?

DetermineAlternatives(NoCost/Risk1st).

ModelAlternativesinSchedule.

InvolveStakeholders.

ImplementMostAppropriateAlternative(RiskandCostalternates).

Constraints

StartonorAfterConstraintAssignedonlytocontractualevents. AccesstoAllAreas,Substant

Completion,PhaseICompletion,etc

ContractmilestonesarecalculatedusingaFinishOnorBeforeconstraintsothatbackwardpass

calculationsareproperlydetermined.

Otherconstraintsnotrecommended.Recommendtheuseofactivitiesandlogicinstead.


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AsPlannedCalculationDataDate=(WorkDay1)

Data Date =1

1 10


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CPMUpdateCalculationDataDate=(WorkDay11)

Data Date =11


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RetainedLogic/OutofSequenceProgress(continued)TheCPMnetworkisupdatedasoftheDataDate.IntheexamplebelowtheDataDateisworkday151.

ActivityAhasstarted,butasoftheDataDatetheactivityisestimatedbythesuperintendenttorequireaadditional5workdays(WD)tocomplete.

ActivityBhasstartedoutofsequencerelativetoitsplannedFinishtoStartrelationshipwithActivityA.

isalsoestimatedbythesuperintendenttorequireanadditional5WDtocompleteafteractivityAhas

finished.

Notethathistoricalinformation(actualdates)arenotincludedintheforwardorbackwardpass

calculations.

ActivityA RD=5wd

ActivityB RD=5wd

DataDate=151

EF=155

151+5 1=155

FSRelationship

EF=160

156+5 1=160

Dashedlineis

impliednot

graphicallyshow


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UpdatingProjectCPMSchedulesUsingIndustryStandardsandGuidelines

BaselineandUpdatedCPMNetworks

TheAsPlannedCPMNetwork

TheAsPlannedCPMnetworkrepresentsthecontractorsplanforprosecutingthescopeofworkknown

ofbidday.InsomecasestheprojectCPMnetworkisdevelopedseveralweeksafterNTPisissued.Itis

imperativethattheCPMnetworkdevelopmentteambuildtheasplannedCPMnetworkwithblinders

sothatinformationreceivedafterbiddayisnotincorporatedintotheprojectplan.Forexample,the

contractormayfindoutafterthebiddatethatthesoilonsiteiscontaminated.Theadditionaltimefor

removalofthecontaminatedsoilmustnotbeincludedintotheBaselineAsPlannedCPMnetwork.Witho

aBaselineAsPlannedCPMnetworkasareferencepoint,thetimeimpactfortheaddedscopeofwork

(contaminatedsoil)cannotbeaccuratelymeasured.

TheUpdatedCPMnetwork

TheupdatedCPMnetworkrepresentsthecontractorsplanforprosecutingthescopeofworkasofbidd

,itaccountsfortimethathaspassedsinceNTP,itaccountsforactionsthathaveorhavenotoccurredas

thestatusdate(datadate),anditaccountsforscopechangesthathavebeenintroducedtotheproject

sinceNTP.AllstatusinformationisincorporatedintotheCPMnetworkupdateasofthedatadate.TheC

forwardandbackwardpasscalculationsareperformedasofthedatadate,andtheCPMnetworkis

analyzedforvariancefromtheoriginalplan.Criticalandnearcriticalactivitiesaregivenspecialattention

WhenthecriticalpathoftheCPMnetworkslips,(negativeCPMnetworkvariance)thecauseofthe

slippagemustbeidentified.Thepartyresponsiblefortheslippagemustbemadeawareoftheslippage,

andgiventheopportunitytoovercome(cure)theslippage. Asubcontractorthatisresponsibleforthe

criticalpathslippagemayelecttoworkovertime,expeditematerials,orapplyadditionalresourcestothe

project.Iftheownerisresponsibleforthecauseoftheslippage,theownermaydirecttheGCtospend

additionalmoniestopurchaseadditionalresourcestoovercometheissues,ortheownermydirecttheG

nottoacceleratetheremainingwork,butplantofinishlaterthantheoriginalcontractcompletiondate

Inthatcase,theownerwouldberesponsibleforcompensatingtheGCandsubcontractorsforadditional

generalconditions(fieldoverhead)costs.

AsPlannedScheduleBaseline

AddedScopeWeatherUpdatedSchedule Current


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CPMNetworkUpdates

Purpose

Performancemeasurementagainsttheoriginalbaselineaswellascurrentplan.

Incorporationofchangesintheplannedsequenceofworkdifferentapproachtothework.

Incorporationofscopechangesindividualchangesaswellascumulative effect.

Historicalrecordcanbeusedasatooltorebuildcourseofevents.

FrequencyofUpdates

Atleastonceeachmonthprojectspecific.

Weeklyupdates perferableandeasier.

Anytimeanunexpectedeventoccurscreatewhatifscenarios.

DataCollection

DataDate(ScheduleAsofDate).

Activity

Actual

Start.

ActivityActualFinish.

Activity remainingduration.

Activitypercentcomplete.

Toolsfordatacollection

o P6updatedturnaroundreportprintoutfillintheblanks.

o Markedupscheduleonwallinformationobtainedfromlargesheets.

o Siteinvestigationwalksiteonaregularbasis.


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CPMNetworkUpdates(continued)UpdateConsiderations

Createaprogressonlyupdate(nologicchanges).

Copyandrenamepriortoincorporationofchanges.

Remembertoupdateownersactivitiesie.reviews.

Remembertoupdateprocurementactivities.

Remembertoadjustthedatadatetothecurrentperiod.

Remembertoperformaperiodcloseout(forcostsdata).

PotentialCausesofScheduleLoss

Weather

Lackof PerformaceGC,Subcontractoretc.

LaborProblems.

Manpower.

MaterialDeliveries.

DesignProblems(includesRFIsandresponses).

AccessToWork.

InternalPlanning/Coordination.

ScopeChanges.

UpdateAnalysis

CPMnetworkVariance(DifferenceBetweenthe:EarlyDatesoftheBaselineCPMnetwork,Early

Dates

of

Prior

CPM

networks

and

Early

Dates

of

Current

CPM

Network).

TotalFloat(LateFinishEarlyFinish)

SlippageCauseIdentifcation.Establishpartyresponsibilityforrecovery.

Notethatthecriticalpathmaychangefromupdatetoupdate.


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Baselines/Updates UpdatingtheScheduleP6

Afterfinishing theoriginalscheduleandpriortoapplyinganyprogresstothescheduleitisnecessaryto

firstcreateabaselineschedulesothattheoriginaldates,durationsetc.(information)remainunchanged

Progresscanthenbeappliedtothecurrentversionofthescheduleandmeasuredagainstofthebaseline

schedule.

1. CopyingaProject

InthePROJECTSMODEselecttheprojecttocopy(BASE),rightmouseclickandselectCOPY. Stayingint

sameEPSstructure,rightclickPASTE.

ClickOKineachofthefourdialogboxesthatcomeupaftertheCopyandPastefunctions.

ChecktheBaselinebox

whenyouhave

establishedafinalbaseline

scheduleandyouarein

theupdatingphase


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CopyingaProject(continued)

2. RenametheProjectAfterCopying

ThiswillcreateacopyoftheBASEscheduleandwillautomaticallynameitBASE1thisshouldbemanual

renamedtosomethingmoreappropriate(UP01). ClickintheProjectIDandProjectNamecolumnand

changethenamesmanuallyasshownbelow.

ReceivingaMarkedUpUpdatedSchedule

Incertainsituationsamarkedupcopyoftheschedulefromasuperintendant,foremanorageneral

contractormayhavespecificdatesusefulforanupdate. Thegraphicbelowshowshandmarkedstatusto

theexistingtrainingschedule.


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CopyingaProject(continued)3. UpdatingtheCurrentSchedule

SelectFILE,CLOSEALL. Thenselect(FILE,OPENor )theUP01projectusetheinformationcontainedi

the

table

listed

below

to

update

the

UP01

project

schedule.

After

the

file

is

open

make

sure

the

activitiesdetailwindowisopenatthebottomofthescreen. ToopenselectVIEW,SHOWONBOTTOM,ACTIVITY

DETAILS. Seegraphicsbelow.

NextselecttheSTATUStab. Seegraphicbelow.


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CopyingaProject(continued)IntheSTATUSfieldwithintheSTATUStabentertheactualstartandorfinishdates,remainingdurationa

thepercentcomplete. Noticethatitreflectsthesamedatesasthehandmarkedupscheduleonthe

previouspage

Actual Actual R

Act ID Start Finish Description D

C10020 20-Apr-09 REMOVE ELEC. EQUIP. IN AC SWBD ROOMS SWGR #1

C10000 01-Apr-09 14-Apr-09INSTALL GEN QUICK CONNECT TROUGH/RACEWAYSWGR

O10000 15-Apr-09 WMATA PROVIDES TEMP GENERATOR

C10010 18-Apr-09 23-Apr-09 CONNECT OF TEMP MAIN DISTRIBUTION

P10000 01-Apr-09 F&D EQUIPMENT - ELEC. EQUIP. AC SWBD RM

TostatusanactivitystartedorcompletednavigatetothecenterlowerportionoftheStatustabandsele

acheckintheboxnexttoSTARTED. Afterstartinganactivityselectthedatedropdown(righthandside

calendar)boxandpopulatethecellwiththecorrectstartdate. Repeattheprocesswiththecompletion

dateonlyiftheworkhasbeencompleted. Seegraphicsbelow.

Clicktocreateacheckinthe

boxtostartorcompletean

activity

Selectthedatedropdown

toassignthecorrectdate


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StatusingforAcutalsandtheDataDate

Whenstatusingforactuals onanupdatetheDataDateshouldalwaysbekeptinmindbecauseofits

relationshiptocurrenttime. ActualscannotbestoredaftertheDataDate.

Forexample,ithasbeendeterminedthatonMay7th

theschedulewillbeupdated,buttheDataDateiss

atMay1stforstatusthroughApril. ThereareworkactivitiesthathavecompletedinearlyMay,butthey

cannotbestatusedascompleteinthescheduleduetotheDataDatebeingsetatMay1st

.

Thisprinciplemustbeupheldforproperstatusingofaprojectscheduleandforcorrectfloatvalues.

IncorrectStatus:C10020finisheson5/8/09AandC10030startson5/8/09A.

CorrectStatus:C10020showsaforecastedfinishof5/8/09andC10030hasaforecastedstartof5/11/09

Note:NoactivitiesshouldeverbeStartedorCompletedtotheRIGHToftheDataDateline.


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CalculatingtheScheduleAfterUpdating

Afterthedatahasbeeninputintothescheduleitisnecessarytorescheduletheprojecttodetermineth

newdatesandfloatvalues. RecalculatetheCPMNetwork(ClockorTOOLS/SCHEDULE orF9key)and

changethedatadateto30Apr09.(VERYIMPORTANT)

Thisistheareawhere

theLogfilewillbe

saved

Clickingonthisselectionbox

allowsyoutochangetheData

Date

Uncheckthisboxifyou

doNOTwanttoruna

Logfile

Clicktheviewlog

buttontoviewthe

locationfileonthe

screen

ClicktheSchedulebuttontoperform

ForwardandBack

pass

Basic CPM Updating

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