Making a movie begins when you are handed a screenplay (script). Sometimes it's a spec script that someone is trying to sell or raise money to produce; in which case, being able to do a break-down, board, schedule and budget based on the script will let everyone involved know the approximate length of time it should take to shoot and how much it is likely to cost-important factors in selling the project. Other times, you are hired by a studio or production company to work on a movie after the script has been bought and the project "green lit" (given a firm go and start date). In this case, at least one preliminary break-down, board, schedule and budget have already been done, and everyone involved has their first indication of how long it should take to shoot and how much it should cost to make.