The document discusses various factors to consider when retaining an expert witness for litigation, including: 1) Ensuring the expert has the necessary qualifications for the case through education, certifications, and experience in the relevant field. 2) Evaluating whether the expert can effectively communicate complicated technical information to a jury and withstand challenges to their testimony. 3) Considering the expert's litigation experience, availability, and ability to work with the legal team and withstand potential challenges to their expertise from opposing counsel.