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These changing quantities are called variables. A variable is any factor, trait, or condition that can exist in differing amounts or types. An experiment usually has three kinds of variables: independent, dependent, and controlled.The independent variable is the one that is changed by the scientist.To ensure a fair test, a good experiment has only one independent variable.n experiment usually has three kinds of variables: independent, dependent, and controlled. The independent variable is the one that is changed by the scientist. To ensure a fair test, a good experiment has only one independent variable.
Unit 4 - Controlled Variable. In scientific investigations there are three types of variable. Key independent variable (what we change), dependent variable (what we measure) and the controlled variables (factors we control and ensure are the same each time we do the experiment).Controlled variables make sure that the experiment is a fair test.Controlled variables are... 1  all of the factors.ey independent variable (what we change), dependent variable (what we measure) and the controlled variables (factors we control and ensure are the same each time we do the experiment). Controlled variables make sure that the experiment is a fair test. Controlled variables are... 1  all of the factors.