So, the early start for activity i,

would be the latest early finish of all

the predecessors of activity i.

It's exactly the same concept of activity unknown.

So, the early finish, in this case,

would be the early start of the activity plus the duration of that activity.

As for the backward pass calculations, the objective,

which is also similar to the activity on node, to find and

determine the late start and the late finish of each construction activity.

But adding to that to identify the latest time of each node.

Again, the two equations, quickly here, that I would love for

you to understand not to memorize, here as well,

that the late finish of activity i would be the earliest

late start of all the successors of that activity.

And if you want to do, or calculate the latest start,

would be the late finish of the activity minus the duration of that

activity to give you the latest stat of that activity.

So, let's do the forward and the backward pass calculation.

And what I'm going to do, I'm going to draw the diagram quickly for

you here starting.