Why did the founding fathers create the Constitution of the United States this way?

What do you mean by "This way?" Are you referring to the process that was used or to how they structured the document? And If you mean the process, do you mean why did the constitutional convention work according to the rules it did or do you mean whay was the convention held? If you mean why was the constitution structured the way it was, what specifically do you want to know? Michael Montagne