The impacted as-planned methodology is,
perhaps, the most criticized among all other delay analysis
methodologies. Despite that, one cannot help but notice that the
impacted as-planned methodology survived the challenges and remains one
of the most frequently used methods in many countries, and in various
dispute forums and stages. Of course, the availability of information is
one of the main factors that dictate, on many occasions, the method
that can be used for each particular case, however, this paper argues
that when it comes to the popularity of the impacted as-planned method,
the availability of information is a secondary factor in the analysts'
eyes, it is often the simplicity of the method that makes this method
very appealing to use. This paper examines the settings under which an
analyst will favor this method, the method suitability, and the
objectives and expectations when deciding to use it for delay analysis
applications. The paper will also discuss various implementations of the
method and illustrate the differences in results between these various
implementations.