Original Gantt charts look like this.
There were bar charts across a timeline.
That represented finer levels of detail.
So they represented another level down in the WBS.
And people said, well you know,
we could probably get rid of those bars across there.
And we'll just put some little lines, and
just represent those subtasks that are in here.
And then some people said, yeah you know,
we've still got this timeline across the bottom, and things are working fine.
But, you know? I have some other relationships
once in while.
Like I have a relationship between three and six.
The relationship between three and sjx means there is a diagonal line,
I am looking at a timeline across the bottom and now I have to figure out
the angle of that line and try and figure out how much time that represents.
And Dupont says that is just getting silly,
let's just write this on the lines and now it's the end of the year in 1959 and
we have Activity On Arrow diagrams put together by DuPont.
And then right after that a few weeks later, right after the holidays, the Navy
says we don't really like writing it on the line, we wanna write it in the boxes.
So now we have Activity On Node diagrams.
This was a way to schedule projects for
a number of years until computers got back into the picture.
And now computers become readily available to people and
computers seem to draw Gantt Charts more easily than they draw Network Diagrams.
So now in the 80s and 90s, everybody says,
let's go to this brand new thing called a Gantt Chart and let's use that.
That's a great way to schedule a project.
Gantt Charts look like this.
Computers draw these better, so this is typically what we see now.