Although coordination is commonly thought of as cerebellar-mediated process , coordination is the integration of many different pathways which are all necessary to produce accurate movements. As a result, impaired coordination can be seen in disorders of the cerebellum and basal ganglia as well as various other sensory and motor systems. Finger-to-nose testing is an easy way to assess coordination and simply requires the subject to move his or her finger from the nose to an examiner’s finger or other object, which should be placed as far from the subject while still being reachable, as this distance adds some sensitivity to the test. The subject should be asked to go from finger to nose and back somewhat briskly, but excessive speed is not necessary to evaluate coordination. Rather, the subject should be able to accurately and very precisely touch the fingertip to the examiner’s fingertip. During this test, observe for any dysmetria, which can take the form of missing the target laterally or “pass pointing.” Beware of any vision abnormality or impaired depth perception which will confound the results. Finger-to-nose testing is also a good way to evaluate for an intention tremor. An analogous test in the lower extremities involves having the patient place the heel of one foot on the knee of the opposing leg and carefully sliding the heel down the shin toward the ankle and back again. Another test of coordination is the rapid alternating movements test, which when abnormal is called dysdiadokinesis . One way to perform this test is to have the subject rapidly tap the index finger to the thumb or alternately to tap a thigh or other surface with the dorsum of the hand and then the palm of the hand as quickly as possible. Rapid foot tapping is an analogous test in the lower extremities. Note that mild weakness will tend to slow any rapid alternating movements, and thus this is a good test for evaluating subtle unilateral weakness in a hand or foot, by comparing speed of movements to the other side.