Lawyers who practice personal injury law typically litigate negligence cases involving personal injury, medical malpractice, and products liability claims, either as plaintiffs' personal injury lawyers working on a contingent fee basis or as personal injury defense lawyers, usually working for litigation firms hired by an insurer to defend the claim. This is a classic litigation practice, involving factual and legal investigation, filing of pleadings, motion practice, discovery, settlement discussions, extensive interaction with insurance adjusters, mediation and arbitration, an understanding of insurance law, andoccasionallytrying cases.