Experiment to test the time neutrase and milk solution takes to clear

What is the experiment about? The experiment is about finding the time it takes for a solution of neutrase and milk to clear when using different concentrations of neutrase. Why did I choose to experiment on how the concentration of neutrase effects the time a milk solution takes to clear? I could have chosen to test how the reaction times differed at different temperatures, but I chose to experiment on the effect different concentrations of …

…my equipment fall. What other factors may affect the results? I shall have to make sure that none of the solutions become contaminated as this would affect the experiment. One factor that will always be difficult to compete with is when to judge that the solution is clear, one person's interpretation of clear will be different to another person's. So I will have to make sure that I judge the clearness fairly for each test.