Lean Construction Ireland Annual Book of Cases 2021 75 PlannedVs Actual As part of our weekly reporting mandate, we have now incorporated a PlannedVs Actual Visualisation procedure whereby our 4D Planner along with the Project Manager produces a graphical representation of actual construction progress versus the progress that should have been achieved in accordance with the baseline schedule. All stakeholders can quickly assess if the project is on schedule or not.Critical areas can also be filtered in isolation to truly evaluate the schedule performance of the critical path tasks.During the construction phase of data centres, early access to critical white space areas is often a key milestone for our clients and progress monitoring of these specific areas can be enhanced through 4D modelling.This offers real-time transparency as the traditional methods of progress reporting through detailed Gantt charts can sometimes be confusing and misinterpreted. If required, mitigation measures are easier to develop as 4D offers a platform that can promote collective problem solving and helps unlock the range of experience and expertise within our delivery teams to drive more predictability into the schedule. Figure 3. PlannedVs Actual Progress Scenario Planning & Clash Detection Fast-track scheduling can bring enormous challenges, especially at the CSA and MEP fit-out interfaces where an over-reliance on field coordination can lead to costly rework and schedule delays. On our data centre projects, the plant yards typically consist of multiple AHUs and generators that are accessed and serviced via extensive steel gantries and walkways. At the project initiation stage, we ran several scenario animations using the Synchro software to determine the most suitable means and sequence for the equipment, steel, and cabling installation in these critical work zones.This rigorous front-end planning proved to be extremely beneficial in the long-run, leading to a schedule performance improvement of 30% within these critical work fronts.This right first time approach has led to less fire-fighting in the field, thus increasing morale and confidence for those at the coalface.Validation of access routes for the mobilisation ofAHUs to their final position also proved to be an extremely useful exercise. Taking the time to animate such construction activities allowed us to highlight the potential clashes in advance and determine the optimum amount of containment and cabling that could be installed before the AHUs were guided through a maze of pre-installed equipment and associated infrastructure. At Collen, the implementation of 4D allows our project teams to create more realistic programmes and break down any miscommunication between what is planned and what is actually executed.We believe that high-quality BIM-based design and staff training is a worthwhile investment that will provide significant benefits throughout the project lifecycle.BIM and 4D planning is not a trend, but a way of working that is here to stay. Case 20