Step 1Step 1aStep 1bStep 1cStep 1dStep 2Step 2aStep 2bStep 2cStep 3Step 3aStep 3bStep 3cStep 4Step 5Step 5aStep 5bStep 5cStep 5dStep 5eStep 6Step 6aStep 6bStep 7Step 7aStep 7bStep 7cStep 5dStep 8Step 9Step 10Step 11Step 12

Step 5B: Select your variables

In order to design a good experiment, you need to identify one factor you will change while keeping all other factors the same. This results in a fair test. The factors you will change are called variables. A variable is an object, event, idea, feeling, time period, or any other type of category you are trying to measure.

  • Identify what variable you’ll change in your experiment. Make sure this is something you have the ability to change and measure. This will be your independent variable.
  • Identify what you expect to see as a result of the change. How do you plan to observe and measure this change? This will be your dependent variable.
  • Identify what variable you will keep the same in your experiment. It should be something that you won’t change at all during your procedure. This will be your control variable.