For a personal injury lawyer to successfully pursue your claim the lawyer must prove the defendant was negligent. Negligence is lack of ordinary care. It is a failure to use that degree of care that a reasonably prudent person would have used under the same circumstances. To prove negligence an injury lawyer must prove that the defendant owed you a duty of care, that the defendant breached the duty of care, and as a result caused you to suffer injuries. The injuries can be physical as well as economic.