Reread your hypothesis. It is important to have a strong understanding about whether the results of your study confirmed or rejected your hypothesis.
Analyze the results of your experiment to determine what the most interesting findings are. Compare your results to your hypothesis and look for any anomalies in the results that might need explanation.
Write the first section of the discussion section by starting with a statement about whether your results confirmed or rejected your hypothesis.
Continue your results section by pointing out any anomalies in the results. These are findings you didn't expect. Provide, if possible, any explanations for these anomalies.
Present conclusions based on your findings. These are strongly-worded statements about the ultimate outcome of the study.
Reference previous studies. You want to reference previous studies, regardless of whether those studies had similar or different conclusions. If conclusions of previous studies differed from your conclusions, provide explanations for this difference.
Include any theoretical or practical implications of your study. That is, you want to point out what significance the findings have on the community of researchers in your field.
Finish the discussion section with any limitations of your study. These can range from data collection techniques to not having enough time to test all of the cases you wanted to examine.