estimating schedule durations using ms project pert analysis tool presented by harry smith mpug st....
TRANSCRIPT
Estimating Schedule Estimating Schedule DurationsDurationsUsing MS Project PERT Analysis Tool
Presented by Harry SmithMPUG St. Louis Chapter MemberFebruary 9, 2011
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AgendaAgendaWhat is PERT?Estimating Industry Best
PracticesProject Management ScenarioChallenges Opportunities for improvement PERT Analysis tool demoQuestions
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PERTPERT
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Some Industry Best Some Industry Best PracticesPracticesMultiple estimates (i.e., bottom-
up & top down)
Project team members are the best source of task estimates
Leverage tools if possible
Historical data can be very helpful
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Estimate AttributesEstimate Attributes
Exact-estimate is an oxymoron
Realistic estimates must be:
◦Specific
◦Repeatable
◦Defendable
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Estimating InputsEstimating InputsSubject matter experts (SME) have
been identified for estimating tasks
The WBS has been defined and converted to schedule tasks/activities
The project task dependencies have been identified
Identify which tasks/activities will be estimated using the PERT analysis tool
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Project Management Project Management ScenarioScenario
Deliver software components for new web-based applications and enhancements to legacy systems
Manage the project cost, schedule, and effort within ± 10% of baseline estimates
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ChallengesChallengesSchedule delivery dates were fixed by
the customer.
Costs were constrained by budget estimates set with very few requirements.
Delivery scope was somewhat flexible.
Historically, estimated project completion dates were not very accurate.
In fact, individual task estimates were not very accurate.
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Opportunity for Opportunity for ImprovementImprovementPost-project analysis discovered
that schedule variances were primarily due to weak task estimates.
Focus on improving estimating procedures and techniques without drastically impacting how long it takes to prepare estimates.
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MS Project and PERTMS Project and PERT Getting started – activate the PERT Analysis toolbar
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MS Project and PERTMS Project and PERT Click on PERT entry sheet toolbar icon Click on PERT Entry Form icon and enter values
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MS Project and PERTMS Project and PERTClick on the PERT weighting icon to set
weighting values
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MS Project and PERTMS Project and PERTOn the PERT toolbar click on the
calculation icon to calculate the task average weighted duration
Next go to the duration field and round up or down to whole numbers as appropriate
Tip: When you hit the calculation icon this will not undo like other actions in MS Project
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MS Project and PERTMS Project and PERTAdding a text field for comments
allows you to document any assumptions that were used to come up with values.◦Remember specific, repeatable, and
defendable
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QuestionsQuestions
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PDU for Members & PDU for Members & Guests:Guests:PDU activity code is:
mpugstlouis020911.
PDUs can be claimed under category 3 on the PMI website.
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Contact info: Harry Smith email: