The most crucial part of a science fair project is the actual demonstration of your working model. To visually demonstrate how the scientific principle you have chosen works is a challenging thing to do. Once you have the basic idea of what you want to do get to work on building the working model.

Remember that getting a model to work the way that you want it to can take more than a few tries. So don’t quit if the model refuses to do what you want it to the first time you set it up. A small wire displaced can also make a perfectly well made model malfunction. So check all the stages of your model in detail.

You know through all the research that you have done how it should work. Now its time to put that theory into action by seeing how it translates in the real physical world. Once you have perfected your model make sure that you give it enough practice runs to see that it works well under diverse conditions.

Now you are ready to work on the presentation speech that will accompany the demonstration of the working model at the science fair. This is the fun part as you can make up a script that will highlight all the work that you have done on the model and it will make the model come alive for the judges.