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==Key Stage 3==
===Meaning===
[[Control Variable]]s are all the conditions of an [[experiment]]t that are kept the same.
===About Control Variables===
: Changing more than one [[variable]] in an [[experiment]] makes it impossible to tell which [[variable]] caused the [[result]]s.
: [[Control Variable]]s ensure that only the [[Independent Variable]] could be responsible for a change in the [[Dependent Variable]].
: [[Control Variable]]s make sure an [[experiment]] is a [[Fair Test]].
==Key Stage 4==
===Meaning===
[[Control Variable]]s are all the conditions of an [[experiment]]t that are kept the same.