Before getting into the nuts and bolts of an expert’s methodology and conclusion, the opposing party in a case will likely challenge an expert’s qualifications. Therefore, when attorneys are selecting experts, they critically evaluate credentials, knowledge of a particular subject matter, and opinions in past cases. Truly valuable experts understand the admissibility requirements,  and will critically evaluate their credentials to determine if they are expert enough to take the case.  This article on Expert Qualifications offers suggestions for determining whether to accept retention on a case.