Joss Wood spoke on the art of “Writing Compelling Dialogue” at ROSACon 2015. She said that dialogue reveals characters’ relationships to one another, moves the plot forward and increases tension.
She said it is important to keep the following questions in mind when writing dialogue:
Will the story still make sense if the dialogue is removed?
Does the dialogue increase the suspense for what is to come?
Does it change the character’s situation for better or worse?
Does the dialogue shed some light on what the character wants?
Does it serve to strengthen the character’s resolve or perhaps weaken it?