DIGEST | ISSUE 26From the project specific studies, the most widelyaccepted method of calculating lost productivityaccording to the SCL is the Measured Mile Analysis.Earned Value is also one of the most reliablemethodologies as can be observed in the figure below.(i) Measured Mile compares productivity for two similartasks when one of them is affected by disruption andthe other is not. This is not always an option in caseswhere there is not a section on the works with similarcircumstances to the section that is being analysed thathas not been disrupted.(ii) Earned Value compares productivity of the taskaffected by disruption against the planned productivityfor that task.WHICH REGION USES IT THE MOST?EVM is commonly used in the United States, the UK andin countries where the UK historically has had influenceand involvement such as parts of the Middle East andAsia Pacific.EVM is typically used in medium range and largeprojects and where there is budget for dedicated projectcontrols resources.SUMMARYTo be effective, EVM ought to be set up as early aspossible upon commencement of a project, wherethe Cost Breakdown Structure (CBS) and the WorkBreakdown Structure (WBS) may not yet be defined,in order that they can be defined in parallel. A correctfit between the CBS and the WBS is a crucial factor insuccessful EVM implementation.On a world where the project requirements are rapidlygrowing and where the uncertainty can easily turn theresults of a project from benefits into losses, a correctEVM implementation is a key objective to understandthe cost and time position of a project at any givenmoment, and thus, implement the necessary measuresto mitigate risks and ensure its success.“Action is the foundational key to all success” –Pablo PicassoFigure 4. Reliability of methods quantifying Lost ProductivityWhen performing an Earned Value analysis, the firstthing necessary is to prove that the planned productivityor contract productivity is realistic. In order to provethat one ought to substantiate the productivity usedbased on construction cost databases, machinespecifications or other recognised studies in the field.By comparing both productivities (actual or current vscontractual or planned) one would be able to evaluatethe loss of productivity.If the project is divided into windows and sections wheredisruption is clearly identified, it is possible to get ameasure of that disruption by applying EVM.7
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