Well, for short story dialogue in a story, relevance is a big element. The dialogue should be relevant to the plot, the characters, and the overall theme of the story. Tension is another key. It can be created through the exchange of words between characters. For instance, in a mystery story, two characters might have a tense conversation where one is hiding something. And lastly, clarity. The dialogue should be clear so that the reader can easily understand what the characters are talking about without confusion.