basis of estimate for it services
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Basis of EstimateSoftware Services
AACE Recommended Practice – Draft CE74
NESMA WG ESTIMATION
BackgroundNESMA 2020
Vision of expanding the playing field by collaborationAACE International
Association for the Advancement of Cost Engineering Internationalwww.aacei.org
NESMA interactive member session April 2012Vision of expanding the playing field by collaboration
=> WG Estimation
Functional SizingFSM Methods (ISO)
COSMIC, NESMA, IFPUG, FiSMA, Mark IIBenchmarking: ISBSG
International Software Benchmarking Standards Group=> ISO standard (based on other industries)
Business Needs, what to do with “points”BenchmarkingEstimation
Estimation: ???=> standard (based on other industries) Basis of Estimate: Best Practise 34R-05
Estimation ChallengesEstimation Process
ConsistentControllable
Estimation VerificationDefendableComparable
Estimation ValidationDefendableBenchmark
Purpose of Basis of EstimateDocument the overall engagement scope.Communicate the estimator’s knowledge of the engagement by
demonstrating an understanding of scope, quality and duration as it relates to cost.
Alert the stakeholders to potential cost risks and opportunities.Provide a record of key communications made during estimate
preparation.Provide a record of all documents used to prepare the estimate.Act as a source of support during dispute resolutions.Establish the initial baseline for scope, quantities, effort, duration
and cost for use in engagement control.Provide the historical relationships between base-lined estimates
throughout the project lifecycle.Facilitate the review and validation of the estimates.
Content (I) – General PurposeEngagement Scope Description
Decomposes the solution into its constituent elements; the Product Breakdown Structure (PBS)
MethodologyPrimary estimating methodology (functional size based, expert based, analogy based, process metrics based, parametric)
Estimate ClassificationCost Estimate Classification System, AACE Practice 17R-97
Content (II) – Basis Design
Estimate deliverables (process); architectural documents
SizingUnits (e.g. Functional Size, Technical Size, Support Size)
EffortMethods (and tools) used to convert to size into effort
PlanningActivities, Milestones and Constraints
CostMethods and sources used for determining all unit, effort, subcontract, material and expenditures cost
Content (III) – Risks AllowancesAssumptionsExclusionsExceptions
Anomalies or variances to standard estimating practicesRisks and Opportunities
High risk or opportunity related to cost, duration, quality and/or safety
ContainmentsMeasures included to prevent and/or mitigate the identified risks
ContingenciesManagement Reserve
Content (IV)Reconciliation
major differences between the new or re-baselined estimate and the last published estimate
Benchmarkingcomparisons of overall estimate metrics, ratios, and factors with similar engagements, historical data, and industry data
Quality AssuranceEstimating TeamAppendices:
Estimate Deliverables Checklist Reference Documents
sizing report, requirements, designs, texts, notes, specifications Additional Attachments (optional)
reconciliation report, benchmarking report, risk analysis report
Schedule for publicationBase Document 31-08 readyReview (1) NESMA
[45 days] 01-0915-10 startedRework Version 0.5 16-1031-10Review (2) MAIN
[45 days] 01-1115-12Rework Version 0.8 16-1215-01Review (3) AACE International
[45 days] 16-0128-02
Rework Version 1.0publication AACE / MAIN 01-06
AcknowledgementWorking Group EstimationTon Dekkers (Chair) Galorath InternationalHans Bernink INGMartin Eisma CGIRay Sadal CapGeminiJelle de Vries Ordina
Who wants to join the review of the
Basis of Estimate – Software Services
ContactTon Dekkers
ton.dekkers@nesma.nl
Request
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