I have developed a method of measuring disruption by comparing the As Planned labour down time with the As Built actual labour disruption.
I call it the Measured Gaps Method.
You need to start a detailed level 4 baseline programme that has been resource loaded and modeled.
If there are no resources then these can be added provided it is done properly and skillfully.
From the resourced As Planned baseline generate a histogram showing the planned resource deployment. This will show peaks and troughs and some gaps when no labour is deployed at all.
This will be the measure of the down time inherent in the tender price. Estimators rarely seek this information to start with so it will be a loss to start with but it is your measurement base.
This can be leveled as an average per working day.
Now you need the detailed As Built data which you use to generate the As Built programme.
The As Built programme will have the same resource allowance as the original. Do not include VO’s or Delay Events you only want the simple As Built dates.
Now generate the labour histogram and you will see a different set of peaks and troughs and gaps.
Again this can be expressed as an average per working day.
The difference between the planned average and the as built average is the calculation of the labour disruption over the tender allowance.
This can be converted to money by using the Contract day rates.