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Creating the Project Schedule
Published in Deborah Sater Carstens, Gary L. Richardson, Project Management Tools and Techniques, 2019
Deborah Sater Carstens, Gary L. Richardson
Several other slack-type status parameters can be derived from this view. The most interesting ones are Total Float, Free Float, and Late Finish. Each of these calculations relates to activity views rather than node calculations but can be derived from the node values. Total Float relates to the amount of task/activity slack (variability) before project completion is impacted, while Free Float deals with the same view only for the task successor. Late Finish describes the latest time that the activity can be completed without impacting the schedule. Since the network arrows represent required project work, the various slack views represent vital schedule information for the project manager. It is now time to state that computer software such as MS Project generates this same type of information with its internal calculation engine, but we now know more about how it does this.
Precedence Diagramming
Published in Carl L. Pritchard, The Project Management Drill Book, 2018
You may recall the earlier discussion on a different type of float—free float. Free float is not the same as total float. Free float is how late an activity can be delayed without affecting the early start of the next activity in sequence. Total float is how late an activity can be delayed without having an impact on the end date of the project. In the Figure 18, the network incorporates activities with both total and free float. Be careful in your analysis, as i3 connects only to the finish node of the project and not to activity j.
Network Scheduling
Published in Jonathan F. Hutchings, Project Scheduling Handbook, 2003
There are three basic types of float time and other subfactoring types of float within those basic three. The major three are free float, total float, and negative float. Free float is the exact amount of days that any specified activity can be delayed without delaying the early start of the succeeding activity. As we learned earlier, events mark these days and therein the days of free float available on that activity. In schedule computations, free float is the least difference in days between the early finish event of an activity and the early start event of all following activities.
Quantifying the interruption impact of activity delays in non-serial repetitive construction projects
Published in Construction Management and Economics, 2020
The aforementioned available scheduling models provide the capability of calculating different types of floats including total float, free float and rate float. While existing models can quantify the impact of activity delays on the early start of successor activities and project duration, they are incapable of: (1) quantifying the impact of unexpected activity delays on the interruption of crew work continuity for successor activities in the project; (2) calculating the total amount of time that an activity unit can be delayed without causing interruption to any of its successors; and (3) identifying the specific repetitive activity units that will suffer interruptions in their crew work continuity due to unexpected delays in their predecessor activities. Accordingly, the scope of this study focuses on overcoming these three limitations of existing studies.
Proactive project scheduling using GPU-accelerated simulations under uncertainty environment
Published in International Journal of Computer Integrated Manufacturing, 2023
Over the last two decades, focusing on decision making in scheduling considering the uncertainties in the planning phase, several studies have made attempts to develop a project execution policy or a robust schedule by inserting an additional free float into the schedule. In the execution phase, some studies have discussed rescheduling methods. We summarize conventional research and stress the research gap between them and our research in the following.