The expected forecast completion will be more optimistic and hide delays more often as this method ignores predecessor relationships and allow the progressed activity that can be forecasted to be completed before its predecessor finish ( See Fig.2). Advantages And Disadvantages Of Wikipedia That means you can compare the individual activity that shows as continuity (not showing non-working duration) while using progress override against the activity which is shown as the split activity (showing non-working duration) while using Retained Logic. It also acts as a good comparison tools to identity the individual out of sequence activity against the Retained Logic option. It will be advantageous to use progress override for the Contractor which they can try to present the Client that project is in good shape by hiding delays. However, this may be highly risky as generating perfect logic is very difficult to achieve in real world. It might be advantageous to use this option as it will more accurately reflect actual work done if a sufficient detailed schedule is being used. It indicates there is a lot of critical out of sequence works to be corrected. That means if the project end date is shorten significantly when scheduling option is switched to Progress Override, you may have a lot of work to do. The changes made in the field can be observed.
It is a quick way to check for Out-of-Sequence activity. It is advantageous to run what if scenario especially when total float is analysed. For example, correct the logic of the critical and high risk activities (if they became out of sequence activities) that have been agreed in the estimated schedule assurance review and schedule risk assessment. However, this could be on the advantage side if the effort spent is worth. Scheduler will be busy with fixing logic to reflect the actual sequence in the field or contractor’s current activity sequence, seeking stakeholders’ agreement and documenting the changes. It requires lot of experiences and knowledge, the details information of scope and time in order to design the schedule activity and logical sequences. As Primavera respect CPM (Critical Path Method) rule that require the correct information and the appropriate logic to forecast a realistic completion date, it may be difficult to use in the generic activity of works. This could mislead to send the wrong message to the project team that forecast project completion date is far behind the baseline if the Scheduler isn't aware the changes of critical path activities and/or due to out of sequence activities. This can sometimes produce unrealistic schedule when out of sequence progress occurs and result in inaccurate information and artificially delayed the project.
Therefore, Scheduler has an opportunity to find out why the agreed logic are not being followed. It signals the Scheduler to be aware of what is happening on the ground rather than sitting in front of desk. Owner organization favors “Retained Logic” as this option produce the worst case scenario forecast completion date which signals early warning that help to expedite Contractors to catch up the plan. Industry standard specification most often required the “Retained Logic” option and considered as best practice. Fig-1 (Foundation work begins as the work front available, but it is not allowed to start remaining work until piling work complete on the remaining piles). It maintains all predecessor relationship and will not allow the remaining portion of an in-progress task to resume until its predecessor complete. It produces the most realistic schedule if the levels of detailed information are available and schedule logic were design appropriately.
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