Twelve Exercises for Improving Dialogue
http://www.poewar.com/12-exercises-for-improving-dialogue/

Hewitt, John
Writer's Resource Center
2004

Abstract:

Dialogue is one of the most difficult aspects of writing to master. There are many pitfalls you must try to avoid, such as: Stilted language Dialogue that does not sound like natural speech. Filler Dialogue that does not further the scene and does not deepen your understanding of the characters. Exposition Dialogue that has the character explain the plot or repeat information for the benefit of the audience. Naming Having one character use another character’s name to establish identity. People almost never say other people’s names back to them, and if they do it is a character trait typical of a used car salesman. Overuse of Modifiers Too many dialogue modifiers such as shouted, exclaimed, cried, whispered, stammered, opined, insinuated, hedged and a million others. Modifiers such as this can sometimes be useful, but are often annoying and used as a crutch for poorly designed dialogue.