In Microsoft Project Online or desktop version I can add Lag and Lead. What is Lag? Waiting time. Let’s say that I have two Tasks n my Project:
If I look at the Timeline View, I will get:
As you can see there is Finish to Start relationship between those two Tasks. But, between those two tasks, I have to wait for drying. So, I can not start with painting the walls for the second time, immediately after I finish previous painting. Let’s say that I have to wait 2 days. So, I have to drag Task Painting walls – second time and drop it two days later:
as you can see, I’ve got a Lag time between two Tasks.
Now let’s talk about the Lead time. Lead time is time in Finish to Start relation between Tasks in which Successor can start before Predecessor is finished.
Look at my example:
Let’s say that the new Web will have 5 different pages. For each page I will spend 1 day for Design, 1 day for Coding, and 1 day for Testing. So for 5 pages, Design, Coding and Testing will have 5 days Duration. That is shown in the picture above. And whole process will take 15 days. But what if I can start with coding first page right after it is designed, and with testing right after it is coded. To show that I will move Code 4 days before Design should be finish, and Test 4 days before Code is finished in a same way like I did it when I needed lag time.
And I will get:
As you can see, predecessors are lost. OK! If I try to make Design as Code predecessor, and Code as Test Predecessor, I will now get:
So, to conclude, in Project for the Web I can have Lag time, but not Lead time.