Problem When we change the Remaining duration of an activity, it keeps reverting to the original value. Change the Remaining Duration value of an activity Reason & Solution There could be two reasons of this problem: 1. There is an "Expected Finish" constraint on the activity. When using an Expected Finish constraint, the remaining duration... Continue Reading →

1. Purpose of Constraints in Primavera P6 Date restrictions used to reflect project requirements that cannot be built into the network logic.More accurately reflect real-world aspects of a project.Provide added control of a project.Apply to the entire project or to individual activities.Commonly used project-level constraint: Must Finish ByCommonly used activity-level constraint: Start On or AfterNo... Continue Reading →

The Driving Relationship is determined based on the Relationship Free Float and the business rules for Driving Relationships. Relationship Free Float Relationship Free Float (Rel FF): The Free Float on the relationship. Calculated as Successor Early Start (assuming a Finish to Start relationship) - Relationship Early Finish on the predecessors' calendar. This field is computed... Continue Reading →

In Primavera P6, when we use "longest path" option to determine the critical path, the process to determine the longest path is as follows: The longest path activities are determined by reviewing the schedule backwards (starting from the last activity) through the driving relationships; If the relationship between two activities is driving, then both activities... Continue Reading →

In the schedule update of Primavera P6, there are occasionally gaps (empty spaces) between the actual bars and the remaining bars as illustrated in picture below. The reasons and solutions for the issue are described in this article. Reason 1: Primavera P6 schedules and displays the activities on Gantt chart in a very detailed and... Continue Reading →

In Primavera P6 Schedule Options, there are 2 options for "Calculate start-to-start lag from". The purpose of these option is described below. We have a simple project: Activity A has FS relationship with Activity B Activity B has SS relationship with Activity C with a lag value of 2 days. The schedule option in this... Continue Reading →

In Primavera P6, when you schedule the project and see the Activity Original duration change, it's probably because of Expected Finish date. So what isÂ Expected Finish Date and how do we use it? The Expected Finish date acts as a constraint if the Scheduling Option "Use Expected Finish Dates" is switched on. Use the Expected... Continue Reading →

In Primavera P6, when we assign resource to activity there is a equation: Original Duration x Units/Time = Total Units (Â  Â  Â  Â  Â  10 daysÂ  Â  Â  Â  x 8 hours/day = 80 hoursÂ  Â  Â  Â  Â ) Now when you change duration, which element will be changed: Units/Time or Total Units? That's... Continue Reading →

In Primavera P6, there are 2 popular activity types:Â Task Dependent and Resource Dependent. What is the difference between these types? By choosing the activity type, P6 will select what calendar is used to calculate the finish date of the activity: Choose Task Dependent: P6 use Activity calendarChoose Resource Dependent:Â P6 use Resource calendar It will affect... Continue Reading →

In Primavera P6, there are two important values: Total Float and Free Float. So what are the differences between them? Total Float: is the amount of time an activity can be delayed without delaying the Project Finish Date.Free Float:Â is the amount of time an activity can be delayed without delaying its Successor Activity Finish Date.... Continue Reading →

After 3 months of hard working, we finish a schedule with 5 Day Workweek calendar like picture: Then the Construction team said that "06-Mar-18 is the right Project finish date, but we're talking about 7 Day Workweek, not 5 Day Workweek. Sorry pal, it must be a misunderstanding." What the he**? Changing Activity calendar will... Continue Reading →

We may wonder How does P6 calculates and displays summary information for costs, quantities, user defined fields, dates, durations, float, progress... I will explain it in this article. These calculations and display summaries are based on the currently visible activities. Activities removed from the layout by filters are not included in the calculations and summaries.... Continue Reading →