Overview
A major contractor utilized Primavera P6 to build and maintain the project schedule. DRMcNatty’s used their schedule for a risk assessment to ultimately give the project team an output of a highly accurate risk-adjusted forecast.
Challenges
There were several challenges presented by this schedule: Because it is built in an enterprise environment, many users have access to update/ modify the information contained. This causes potential for redundant logic, open ends, lags, and constraints. All of these are contributors to a poorly built schedule that would produce inconsistent, unreliable results in a risk workshop. Before any risk exercise can commence, the schedule must first be cleansed of the above issues.
Solution
The risk process started by reviewing the contractor schedule file. This review was conducted in Deltek Acumen Fuse. The purpose is to find the areas that hinder a sound risk result. These hindrances include open ends, lags, constraints and redundant logic. Each of these problems was eliminated one at a time with the use of the Deltek Acumen Cleanse function. Schedule quality is key to driving valuable risk outcomes.
Identification of the uncertainty ranging was required to advance the risk model process. In this case, we chose to do +/- 10% for the majority of the schedule. It’s pretty easy to rationalize a 10% change in duration either direction for most activities in a schedule. We then looked specifically at problem areas that were being impacted in the shop and field. These areas were being most impacted by welding, driven by the lack of qualified resources. Competition with other projects in the area was influencing the ability to attract resources. In that mindset, DRMcNatty decided to place a -5/+30% range for the durations of those most affected, piping and structural.
In addition, identification of Risk events with the project team was needed. There were just a few events we wanted to isolate separately from the duration uncertainty to understand what impact these discrete risks had on the Mechanical Completion (MC) of 1st Startup (to meet