Start by stating your hypothesis (what you meant to prove or show with you expiriment or display). Describe briefly your process (the expiriment process or what your display shows). If your display is about an environmental or social or economic issue provide pros and cons for and against or why your solution is a good idea or necessary. Describe outcomes, impacts or use in the world then a brief summary of your thoughts. Youll probably find four pages isnt nearly enough. Good luck. Cant believe they didnt go over this in your science class!