The information placed on a science fair board should convey the hypothesis, scope, and outcome of a science project and show all the steps performed by the project owner. The science fair board is traditionally displayed on a three-panel presentation board.
The left panel of the board shows the work completed prior to conducting the investigation. It includes the abstract (a summary of why the investigation was done in the first place), the question the project is meant to answer, the hypothesis (what the conductor of the experiment thinks will happen when their question is tested), a materials list, and any research that was conducted during the course of the investigation.
The center panel of the display should display the title of the investigation at the top followed by a section dedicated to the procedure (a step-by-step account of how the investigation was conducted), data charts showing outcomes (the investigation should be repeated a minimum of five times to show scientific validity), and pictures of the investigation being completed (no faces should be seen).
The right panel of the display board displays the end-analysis of the investigation. There should be a section devoted to observations, the results and a conclusion (a final answer to the question asked at the outset, whether the hypothesis was correct, as well as any problems encountered or anything else that might have influenced the outcome).
It's worth noting that many science competitions require a log book. The log book documents the day-to-day process of the investigation and acts as a journal of sorts. It is usually displayed on a table in front of the display board.