Discussion (3 points): Discuss the importance of what you found, in light of the overall study aims. Stand back from the details and synthesize what has (and has not) been learned about the problem, and what it all means. Say what you actually found, not what you hoped to find.
In this part, you have to discuss about 2 parts as follow;
The results: what do you think about the results, and why?
The procedure: why do you have to add or do anything in the experiment?