I think one of the biggest areas people fail in is your "Informational Dialogue", and they fail because they think only about the information they, as the author, want to convey to the audience, and not enough about what the speaking character wants to convey to whomever he's speaking with.
So you get dialogue like this:
"Marty, I know you want to kidnap Tina Grandchamp because of the way her father, who employed you for five years, treated you, but don't you think her fiance, the FBI agent, will come after you?"
"No, Ted, because I am an ex-FBI agent myself and I know all the tactics they will use to catch me."
Everyone got bumps on their noggins from being smacked in the head with all that info? If Marty knows, and he knows Ted knows, why would he ever ask him that stuff? If you need to convey that information, do it either in prose near the dialogue, or for god's sake, be subtle.
"Are you nuts, Marty? What, the old man gives you some crap so you're gonna commit a major felony?"
"He didn't just give me crap, Ted, okay? He fired me on Christmas, for Christ's sake. He owes me big. He can start by paying some ransom on his slut daughter."
"I'm not saying the guy's not a jackass. I'm just saying it's not worth getting thrown in jail over."
"I'm not gonna get caught."
"They always get caught. Hell, she's practically married to the FBI."
"He's just a kid, a rookie. I've got ten years experience on him, easy. What can he know that I don't?"
Which isn't exactly subtle, either, but it's 6 am and pre-coffee and you get the idea. Plus, hey, it ups your world count.
An editor might go after it, but at least it'll have a better chance of making it to an editor than with the former bit of dialogue.
The other thing using more dialogue to convey the same information can do, if you do it right, is tell you more about who the characters are. Education and Slang, to put it in Dreamer's terms. Here's a couple of quick and dirty tricks:
- If the character's well-educated, remove as many of the contractions from their speech as possible, without driving yourself nuts.
- The more innocent you want them to come off, the less they should curse. You don't have to make them sound like morons, but remove the... erm... more vivid expostulations, let's say. This works especially well if you have another character who curses with every few sentences. It works even better if you NEVER POINT IT OUT. Maybe your innocent can say something to your curse-spewer about their language. But for god's sake, try not to mention it in your prose. Your reader will note it, however subconsciously, and the mental voices in their heads as they read will reflect the difference.
Some general tips:
- Everyone knows not to overuse slang or dialect marks, right? Once a sentence or so is enough for your readers to get the idea without making them reach for the Advil. I personally believe that all dropped letters should be replaced with an apostrophe. If you're Mark Twain, I'll forgive you for replacing "going" with " goin " instead of " goin' ", but not otherwise.
- And the oldest saw of all when it comes to writing dialogue, read it out loud. Listen to yourself say the words. Do you sound like you wanted the character to sound?
- Want to get really good at dialogue? Take an acting class. Even if you have no talent, someone in the class will be possessed of at least the vestiges of it. Listening to actors "play" with speech to get the right mood and inflection in a sentence is highly instructive.
Any other tips or thoughts people have about dialogue?