How to write dialogue

Want to write the perfect screenplay, well the dialogue is a must.. here are a few good steps to make it work.

1. Listen to how actual people talk
2. Figure out the flow of your dialogue
3. Pattern out the information
4. Write the scribble version
5. Write the nice version
6. Ask: Are characters listening, or just speaking?

http://johnaugust.com/archives/2007/how-to-write-dialogue