Every word in short story must be written for the theme therefore it is very important that theme is clear to you when you write story. Other elements of short stories – characters, settings, plot and conflicts – must tightly but comprehensively be tied to the theme. Be very careful not to be tempted to digress even slightly from the theme while writing short stories. You must heartedly decorate the setting and develop the characters but within narrow subject line as specified by the theme. Sometime, it may so happen that you may not be very sure of the theme while starting your story. No worry, in such case you determine the theme after completing the story and then critically chisel away extra flab that is not really needed for the theme of your short story.