What Are Leads and Lags in Primavera P6 Version 8.2?

Project Planning and Control Using Oracle Primavera P6 - Version 8.2 EPPM WebUnderstanding Lags and Leads in Primavera P6 8.2

A Lag is a duration that is applied to a dependency to make the successor start or finish earlier or later.

  • A successor activity will start later when a positive Lag is assigned. Therefore, an activity requiring a 3-day delay between the finish of one activity and start of another will require a positive lag of 3 days.
  • Conversely, a lag may be negative when a new activity may be started before the predecessor activity is finished. This is called a Lead or Negative Lag.
  • Leads and Lags may be applied to any relationship type.
An example of a FS with positive lag:

positive lag in p6

positive lag in p6

An example of a FS with negative lag:
negative lag in p6

Here are some important points to understand about Lags in P6:

  • The lag duration is calculated on the lag as in Microsoft Project and other Primavera products. A lag is not assigned to one or both of the Predecessor and Successor activities as in Asta Powerproject.
  • Lags may be assigned one of four calendars from the Calendar for Scheduling Relationship lag drop down box in the General Schedule Options form. This form is opened by selecting Tools, Schedule… and clicking on the options tab.

The four Lag Calendar options are:

Ø  Predecessor Activity Calendar,

Ø  Successor Activity Calendar,

Ø  24-Hour Calendar, and

Ø  Project Default Calendar.

primavera p6 version 8-2 info button Lags are calculated by Primavera P3 and SureTrak software using the Predecessor Calendar. Microsoft Project 2003 to 2010 uses the Successor Calendar or may have an Elapsed Duration Lag. Earlier versions of Microsoft Project used the Project Calendar. Asta Powerproject assigns the lag to either or both the predecessor or successor thus allowing either the Predecessor or Successor Calendar to be selected for each relationship.
eh.com.au warning symbol You must be careful when using a lag to allow for delays such as curing concrete when the Lag Calendar is not a seven-day calendar. Because this type of activity lapses nonwork days, the activity could finish before Primavera calculated finish date.

You must be extremely careful when opening multiple projects when the Lag Calendar option is different for each project. This is because all the project options are changed permanently to be the same as the Default Project and therefore some of your projects may not calculate the same way as they did before opening the projects together. Please read the Multiple Project Scheduling chapter for more details on this topic.

Eastwood Harris Supplies Project Management Training Manuals, Project Management Training Presentations and Consulting on Primavera P6 and Microsoft Project 2010 across Australia.

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Activity Information in Bottom Layout – Primavera P6 Version 8.2

primavera P6 version 8.2 spiral bound training bookActivity Information – Bottom Layout Explained – Primavera P6 Training

The Bottom Layout in P6 has a number of tabs where information about the highlighted activity may be viewed and edited.

[like_to_read](These are not in any specific order as the tabs may be reordered on the screen.)

  • General
This form displays the:

  • Activity ID and Activity Description.
  • Project and Responsible Manager, these may not be edited here.

It also displays activity attributes including some which were set as defaults in the Project Window:

  • Activity Type, Duration Type, % Complete Type, Activity Calendar, WBS, and Primary Resource.
  • Status
This is where the following data is displayed/edited:

  • The Durations,
  • The Status, where Actual Dates and % Complete may be entered,
  • Where Constraints are entered, and
  • By selecting from the drop down box the Labor and Nonlabor Units or Costs and Material Costs may be displayed.

NOTE: It is possible to assign resource Units in the Status tab without a resource being assigned to the activity and the rate will be taken from the Project Properties Calculations tab.

  • Summary
This form displays summary information about the activity. It has three buttons that select which data will be displayed:

  • Units or Costs or Dates.
  • Resources
Resources and Roles may be assigned to activities and assignment information displayed.
  • Expenses
Expenses may be added and edited here. These are intended for one-off costs that do not require a resource to be created.

NOTE: These are often used for material costs on construction and maintenance projects to prevent clogging up the Resource Window.

  • Notebook
Notes about activities may be made here by adding a Notebook Topic and then adding notes about the topic.
  • Steps
This function enables an activity to be broken down into increments titled Steps that may be marked as complete as work on the Activity progresses.
  • Feedback
This is where comments made in the timesheet module may be viewed.
  • WPs & Docs
This is where files that have been listed in the Work Products and Documents Window may be associated with activities and then opened from this form.
  • Codes
Project Codes may be created and activities associated with these codes with this form. These codes are similar to P3 and SureTrak Activity Codes and activities may be organized in a similar way.
  • Relationships,

Predecessors &


This is where the activity’s predecessors and successors are added, edited, and deleted. This is covered in the Adding the Dependencies chapter.

Eastwood Harris Supplies Project Management Training Manuals, Project Management Training Presentations and Consulting on Primavera P6 and Microsoft Project 2010 across Australia.[/like_to_read]

How to Define Calendars in Oracle Primavera P6 Version 8.2

Primavera P6 Version 8.2 Training manual by Paul harrisDefining Calendars in Primavera P6 Version 8.2

The finish date (and time) of an activity is calculated from the start date (and time) plus the duration of the calendar associated with the activity.

Therefore, a five-day duration activity that starts at the start of the workday on a Wednesday, and is associated with a five-day workweek calendar (with Saturday and Sunday as non-work days) will finish at the end of the workday on the following Tuesday.

defining calendars in primavera p6 version 8.2

Primavera has three categories for calendars:

  • Global – These calendars are available to all Projects and Resources.
  • Project – These calendars are only available to the projects they are created in. These may only be created for a project when that project is open.
  • Resource – There are now two types of resource calendars: Personal, new to Primavera Version 8.1, and Shared, which is the same as the earlier Resource calendar.

Ø  A Personal calendar is created for a specific individual resource.

Ø  A Shared Resource calendar may be assigned to one or more Resources, which in turn may be assigned to an activity in any project.

A Resource will be scheduled according to a Resource Calendar when the Activity Type is set to Resource Dependent; otherwise the activity is scheduled according to the Activity calendar.

eh.com.au warning symbol When an activity is made Resource Dependent, unlike in some other software, it still acknowledges the Activity Calendar for calculating the start of the resource work. Some software ignores the Activity Calendar and ONLY acknowledges the resource calendars when an activity is made resource-driven. You may wish to consider placing resource-driven activities on a 24-hour, 7-day per week calendar in circumstances when resource calendars have start times that are earlier in the day than the activity calendar start times. This prevents a delay to start of resource-driven activities by an Activity Calendar.

You may create a new, or edit an existing, calendar to reflect your project requirements, such as adding holidays or additional workdays or adjusting work times. For example, some activities may have a 5-day per week calendar and some may have a 7-day per week calendar.

This chapter covers the following topics:

how to define calendars in primavera p6 version 8.2

Eastwood Harris Supplies Project Management Training Manuals, Project Management Training Presentations and Consulting and Training on Primavera P6 Software and Microsoft Project 2010 in Sydney, Melbourne, Brisbane and Perth, Australia.