PMBOK® Guide: Project Schedule Management- Lead and Lag

Sometimes we need to either speed up the dependent activities or delay the dependent activities while keeping in the relationship as is. This is the purpose of Lead and Lag.
Lead:
Lead means ahead of time, go a little bit fast. In the case of Finish-to-Start relationship, whatever time you want to lead, you need to reduce the start time of next activity by that time. For example, in the case of 2 days as lead time in FS relationship = ST (Start time)-2 Days.

Lag: The lag time is added in the actual start date of the next activity. For example, in the case of building and painting, you say that first let me finish the product and then after a gap, I want to start painting. You need a gap of certain days before you start painting, so this is lagging time. A duration where no work is done. So leading refers to work done in parallel by 2 activities whereas lagging means giving a gap of some duration between 2 activities.

In Simple language Lead is something running ahead as speed and lag is an amount of gap introduced in between two activities.

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The Project Management Professional (PMP), PMBOK, The Agile Certified Practitioner (PMI-ACP), and The Professional in Business Analysis (PMI-PBA) is a registered mark of the Project Management Institute, Inc.
PMBOK is a registered mark of the Project Management Institute, Inc.

Materials in this video are based on the text, A Guide to the Project Management Body of Knowledge, (PMBOK® Guide) – Sixth Edition, Project Management Institute Inc., 2017.

The PMI Registered Education Provider logo is a registered mark of the Project Management Institute, Inc.
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[waqarulhassan]

finally, someone explained it well. Thank you!

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[virginiasanchez]

Wonderful explanation... Very clear.. Thank you for the content...

[Zahid-Raja]

Leads can only be applied to activitied with finish to start.Lags on the other hand can be applied to all relationdhips.

[rajneesh]

Clear and good explanation.
Thanks for your informative Videos.

[husseinalm]

I have a few questions,
is LEAD/LAG established before construction begins as in during the scheduling stage OR developed during the construction stage as its ongoing?
and if LEAD/LAG are established before construction begins, then does that mean the schedule is flawed? as in it could have been avoided by better scheduling
and could the project manager freely decide to ignore the LAG time and keep working OR ignore the LEAD time and stick to actual activity time OR is he obligated to follow LEAD/LAG?
so, does that means LEAD/LAG is superior to the actual start/finish time for each activity and the manager MUST follow it OR its optional and it just attempts to improve the schedule ?

[dineshkapoor]

Thanks for this video Sir, this has helped a lot and clear understanding between lead and Lags.

[platelet]

Your explanation is logical and clear. But figure 6-10 Examples of Lead and Lag in the PMBOK 6th edition is not clear and is confusing. Their examples seem to be switched for Lead and lag.

[shommytv]

So extremely helpful. You helped me make a breakthrough.

[antoniobiancofiore]

is this correct wrt Lead and Lag in using "painting" as the 2nd activity....for example classrooms 1, 2, 3, & 4 are to be drywalled, taped and prepped before paint but rather than start the painting activity on day 6 you want to start the painting on day 5 which means you begin painting classroom 1 & 2 while classrooms 3 & 4 are being is assuming that each classroom is being drywalled, taped and prepped for paint one at a time this classroom 1 & 2 are done by day 5...is this a good example of lead?

[vishwanaib]

Is lead applicable to all kinds of processes? I guess it is applicable only to FS

[mustafasatc]

I am a bit confusing. lag time is ok. But what is the difference between fast tracking and lead time. are they similar?

[harshadshinde]

Sir, does duration of dependent activity changes with addition of lead & lag ??

[anhtiennguyen]

yeah lead means..leading, and lag means lagging. As clear as mud