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Tip #3: Operationally define all variables before experimenting |
Before you begin experimenting, you must ask yourself how you will operationally define your variables. In other words, how will you measure them so that they can be put into number or quantitative terms?
If you are measuring growth of a plant, then how will you define "growth?" Is it the height of the plant (measured in millimeters or centimeters)? Is it the weight of the plant (grams)? In your experiment, does growth refer to the size of the leaves? Whatever you want growth to be in your experiment must be clearly defined ahead of time. Write down all measurements you will use to define each variable operationally.
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