Project Scheduling Project Scheduling and Crashingand Crashing

Recall the four Recall the four stagesstages

Project Conceptualization and Project Conceptualization and DefinitionDefinition

Project Planning and BudgetingProject Planning and BudgetingProject ExecutionProject ExecutionProject Monitoring and ControlProject Monitoring and ControlProject Termination and Project Termination and

CloseoutCloseout

Recall the four core Recall the four core knowledge areasknowledge areas

Recall the four Recall the four facilitating knowledge facilitating knowledge

areasareas

Recall the four project Recall the four project player typesplayer types

Recall five processes Recall five processes within the scope within the scope knowledge areaknowledge area

1.1.       Plan Scope Management       Plan Scope Management 2.2.                Collect RequirementsCollect Requirements 3.3.        Define         Define ScopeScope 4.4.                Create WBSCreate WBS 5.5.                Validate ScopeValidate Scope 6.6. Control Scope Control Scope

Time Management Time Management Knowledge Area - Knowledge Area -

ProcessesProcessesPlan Schedule ManagementPlan Schedule ManagementDefine ActivitiesDefine ActivitiesSequence ActivitiesSequence ActivitiesEstimate Activity DurationsEstimate Activity DurationsDevelop ScheduleDevelop ScheduleControl ScheduleControl Schedule

Activity DefinitionActivity DefinitionDecomposition –top down….Decomposition –top down….

– What has to happen in order to What has to happen in order to create a WBScreate a WBS

Composition from the bottom Composition from the bottom upup

Use of a templateUse of a template– A list from a previous project A list from a previous project

that is that is similarsimilar

Consider the 2004 Consider the 2004 Construction EstimatorConstruction Estimator

ExcavationExcavation FoundationFoundation FlatworkFlatwork Brick hearth & veneerBrick hearth & veneer Rough hardwareRough hardware Finish hardwareFinish hardware Rough lumberRough lumber Finish lumberFinish lumber Rough carpentry Rough carpentry

laborlabor Finish carpentry laborFinish carpentry labor

Rough carpentry Rough carpentry laborlabor

Finish carpentry Finish carpentry laborlabor

CountertopsCountertops CabinetsCabinets InsulationInsulation RoofingRoofing PaintingPainting Shower & tub Shower & tub

Activity SequencingActivity SequencingInterview CIO

Interview Manager A

Interview Manager B

Interview Manager C

Interview Manager D

Compile interview data and analyze

Prepare report

Prepare and deliver presentation

Sequence Sequence RelationshipsRelationships

Finish/StartFinish/StartStart/StartStart/StartFinish/FinishFinish/FinishStart/FinishStart/Finish

Project NetworksProject NetworksActivity on nodeActivity on node

–Most popularMost popularActivity on arrowActivity on arrow

–Not used Not used

From project networks, From project networks, we determinewe determine

The project durationThe project duration The critical pathThe critical path Tasks on the critical pathTasks on the critical path Tasks not on the critical pathTasks not on the critical path Slack associated with non-critical Slack associated with non-critical

taskstasks Earliest start, earliest finish, Earliest start, earliest finish,

latest start and latest finish latest start and latest finish timestimes

Tabular formatTabular formatNAME DURATION PREDECESSORS

A 5

B 10

C 5 A, B

D 20 A, B

E 5 C

F 10 D, E

The AON NetworkThe AON Network

A/5

D/20B/10

E/5

F/10

C/5

The AOA NetworkThe AOA Network

Start and Finish Start and Finish DatesDates

ES EF

N/K

LS LF

NotationNotation ES – earliest start for the node, assumed ES – earliest start for the node, assumed

to be at the beginning of the dayto be at the beginning of the day EF – earliest finish for the node, assumed EF – earliest finish for the node, assumed

to be at the end of the dayto be at the end of the day LS – latest start for the node, assumed to LS – latest start for the node, assumed to

be at the beginning of the daybe at the beginning of the day LF – latest finish for the node, assumed to LF – latest finish for the node, assumed to

be at the end of the daybe at the end of the day N -- the label of the node (task, step, N -- the label of the node (task, step,

activity)activity) K -- the duration of the node ( number K -- the duration of the node ( number

following the slash)following the slash)

Start and Finish Start and Finish DatesDates

ES EF

N/KLS LF

Precedence Precedence RelationsRelations

With FS (FINISH/START) With FS (FINISH/START) relationships, a successor relationships, a successor activity does not start until activity does not start until all of its predecessors are all of its predecessors are

ExampleExample 1 1

A/6

B/7

C/8

D/10

Example 2Example 2

A/6

B/7

C/8

D/10

Example 3Example 3