The Extension-of-Time Claim - Construction Claims and Responses: Effective Writing and Presentation - page 103

I once spent a considerable number of hours preparing a claim docu-
ment on behalf of a contractor after being advised by the contractor's
project manager that a certain delay event justifi ed an extension of time.
It was only after I had done most of my work and the delay event was
impacted into the baseline programme by the contractor's planner, that it
was discovered that there was actually no effect on the completion date
and, consequently, my client was not actually entitled to an extension of
time at all. For this reason, it is important to run the delay analysis as soon
as the circumstances causing the delay have ceased, so that the effect,
if any, on the completion date may be seen.
One of the frequently-used methods of delay analysis is to impact the
delay into the current baseline programme to produce an 'impacted as-
planned' programme and this may be done by several methods according
to the circumstances. Some examples are as follows:
1. If the delay event affects the start date of an activity, then the planned
start date should be adjusted accordingly.
2. Possibly the delay event prevented the end date of an activity from
being achieved, in which case the end date should be adjusted.
3. The delay event could have prolonged an activity which may be
demonstrated by revising the duration by the appropriate number of
days.
4. Sometimes a delay event may be demonstrated by including the delay
event itself as a new activity within the programme. If this method is
chosen, the appropriate logic links must be introduced.
The resulting impacted as-planned programme will show the effect of the
delay event on the critical path and, consequently, on the completion date.
The revised completion date will, in turn, demonstrate the extension of
time to which the claimant is entitled.
Here is an example of how our example claim document could deal with
the method of delay analysis:
SECTION 5
THE METHOD OF DELAY ANALYSIS
Introduction
This section describes the methodology used to demonstrate the effect
of the delay event on the programme and consequently, on the planned
Time for Completion and thus demonstrates the extension of time to
which the Contractor is entitled.