Construction professionals as habitual users of scheduling software should recognize the presence of phantom float because it may lead them to make decisions based on unrealistic schedules. Phantom float is created in resource-constrained schedules because the existing RCS methodologies neglect the resource relationships that arise between activities when competing for the same but unavailable resources. The aim of this paper is to illustrate the presence of phantom float in Primavera’s P6 and Microsoft’s Project schedules. RCS calculations suggest that activities have float but much of this float does not exist - hence, the name of phantom float. However, they report incorrect total float values and a broken critical path. These two programs fix the resource supply-demand problem by performing a Resource-Constrained Scheduling (RCS) technique. The studies found in the literature agree that Primavera™ is the most frequently used software in the construction industry, followed by Microsoft Project™. On a regular basis, professionals use commercial available software to resource load the schedules without paying attention to the resulting critical path. Time/Location: Monday, June 25 from 2:15pm to 3:15pm / Coronado D (4th Floor) (PS-2752) Phantom Float in Commercial Scheduling Software Author(s)/Presenter(s): Diana M. This enhanced evaluation of progress, changes, and revisions to schedule logic will allow the Project team to understand the challenges a project faces. Modern analytical programs make it possible to see the impacts and risk associated with changes made to schedules. Often, changes to a schedule are described in a schedule narrative or buried in a ‘claim digger’ style comparison report, so impact of these changes is not always clear or understood. This practical applications paper demonstrates how to review schedule updates using these programs by reviewing the capabilities of Deltek Acumen Fuse. Since the latest version of this Recommended Practice was issued, software is being used by project teams to perform a more enhanced analysis of the reasonableness and accuracy of a schedule update. AACE current Recommended Practice 53R06 “Schedule Update Review – As Applied in Engineering, Procurement, and Construction” provides guidelines for project schedulers in creating a schedule update and for project reviewers to assess the reasonableness of changes in a schedule update. The ability to understand the impact that changed or new schedule logic has on a project schedule is critical in Project Management. Time/Location: Sunday, June 24 from 1:00pm to 2:00pm / Coronado D (4th Floor) (PS-2744) Enhanced Evaluation of Schedule Updates Author(s)/Presenter(s): Joseph R.
0 Comments
Leave a Reply. |
Details
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |