When selecting an expert witness, choose the one best qualified and make sure that the expert’s work on the case is better than that of the opposing expert. When possible, the expert witness should adhere to the scientific method by testing and confirming each underlying fact or premise in your case. For example, the anesthesiology expert witness testimony should be based on similar observations and tests as opposed to mere thoughts. This has two advantages. It allows you to test the expert’s thesis for accuracy and it provides a firm basis for arguing why the judge or jury should accept the proven opinions of your expert.