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Aren't "windows" delay analysis flawed by the common condensing of schedule as schedule goes on?

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John Reeves
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Aren't "windows" delay analysis flawed by the common condensing of schedule as schedule goes on?  -  Do if the project is complete and you have 5 delays at 20 days each, but he job is only 20 days late - couldn't you just prorate each delay - because none should get credit for other changes to bring it back onto "close to"  schedule?

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John Reeves
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Thank you very much for the comment, that is what makes this site great!  I am dealing with a contractor doing Windows analysis and the total of the Windows adds to up to more than the project is delayed.  Not sure yet, if it is concurrency, logic changes or yet, but that is why I asked if a contractor should be given the day "due" or the days "necessary" when it is showing less.

Patrick Weaver
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The 'windows' approach to delay analysis is supported by AACEi and many legal precedents. BUT the delay within the time window does need to be shown to cause a delay to the completoin of the project: Costain Limited -and- Charles Haswell & Partners Limited 2009] EWHC B25 (TCC). See: https://mosaicprojects.com.au/PDF_Papers/P035_Assessing_Delays.pdf