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: There are three types of variable.
*[[Independent Variable]]: The thing you choose to change in an [[investigation]].
*[[Control Variable]]s: The things you keep the same in an [[investigation]] to make it a [[Fair Test|fair test]].
*[[Dependent Variable]]: The thing you measure or observe in an [[investigation]].
: In an experiment or investigation there should only be 1 independent variable. If you change more than one thing at a time, it is not a [[Fair Test|fair test]].
===Examples===
An investigation to test the claim: All leaves are green.
*'''Independent Variable''': Where you chose to put the cress seeds.
*'''Dependent Variable''': The observations of the cress seeds.
*'''Control Variable''': How long you left them for. They should all be left for the same amount of time or it's not a [[Fair Test|fair test]].*'''Control Variable''': How much you watered them. They should both be watered the same amount to make it a [[Fair Test|fair test]].
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