That was the "Marvel Method". Where DC worked from full scripts and with a very rigid house style, Marvel was having their artists basically run wild with nothing more than a vague plot. The artist's job was to pace the story and often Stan Lee, and later on Roy Thomas, would be introduced to strange and wonderful ideas they never thought of but were responsible for dialoguing. Most of the time it worked marvellously( no pun intended!).Read MoreMarvel Method or Full Script?