I like to compare making a film to building a house:
- Pre-production (concepts & writing, art direction) is the architect and the builder and the homeowner drawing up a blueprint.
- Production (video, sound) is going to the lumber yard, buying all the materials and loading them on a truck.
- Post-production (editing, graphics, sound) starts with that truck parking at an empty lot and the driver catching a taxi home.
For my own films, and for smaller projects, I do all of these steps myself. Sometimes I hire freelancers. Often, as with National Geographic, I am subcontracted to shoot what someone else will edit.