Riveraj

It is worth noting that Mike’s view not to use Windows is just one view amongst many.

I would suggest that you careful listen to what the delay expert is saying and then question his method etc if necessary.

At the end of the day, it is the tribunal that decices the dispute that will need to be convinced, and they may not understand the complexities of delay analysis, and as such the experts abiity to make it as "understandable" as possible is very important.

Regards

Toby

Thanks Mike for ur explanation.

For ongoing work the windows method is the only method to be used because there is no as built data for the future.

And u r saying in forensic situation Windows Analysis not to be used.

So, what @ awarding an interim extension of time? If v r in middle of the project and contractor has submitted their claim, then shall i wait upto end of the project or shall i adopt windows slicing method for analysis?

Hi Mike,

It is being used now on the world’s most prestogious building project (To be inaugrated tomorrow). It is such a complex project, with n number of issues, but these guys have covered each and everything beautifully in their submission. I have used it twice but on a comparatively small and simple projects.

But still as far as my point goes, windows slicing is only for presentation and one has to use as-built but-for method or suitable analysis method.

The computers have in fact, made the windows slicing more favourable. For a three year project, u can use windows of 1 month each and then can update the program at the end of each window and then can analyse the critical path thereon. This will make the analysis more dynamic in nature reacting to the changes / variations with each updated window.

In short, u can use any analysis method depending upon teh data available, but instead of using it for the whole project, use it for each window period.

(Claim consultant don’t use this because it takes lot of time and effort to present the case in a neat and clean way. Rather they prefer to print tons of paper and use a fork lift to carry from one office to another.)

Coming back to the original question of Methods of Impact Analysis, these are the methods

A. Static Method:
1. As-planned versus as-built
2. as planned impacted
3. as-built but-for

B. Dynamic Method:
1. Time Impact Analysis

Hi Shareef,

Let me clarify u regarding the Windows Analysis. Here’s my two cents

Windows (Watersheds) is not a method a analysis but it is just a graphical presentation of conducting an EOT Analysis or u can say, it is a methodology . The project duration is divided into smaller periods (Quarter, months, weeks) for analysis and then u can apply any technique to these windows.

The important asepect of this method is NOT in what is analysed or how, but in the point at which it is analysed.

The method for analysis can be decided which is suitable to the data to be analysed. Some people use as-planned versus as-built while some people prefer as-built but for method.

At the end of each window, the critical path is analysed to determine the effect of the delay event.

Each window will have very limited activities for analysis and so, it is more accurate. However, if teh as-built records are not available, then the quality suffers.

It takes time, but it is a great tool eapecially for the management to understand what these claim consultants have done after taking millions from their pocket.

:-)