This second edition publication is an essential resource for health care professionals who need to make informed, evidence-based decisions that determine causation for injury and work-related conditions. Users are able to strengthen their opinion by linking clinical findings to a specific cause-whether related to the workplace, genetic makeup, a unique event or a combination of factors. Professionals can provide an informed opinion on workers' compensation or disability cases based on a careful review of an individual's clinical findings when linking (or not linking) the condition in question to medical evidence.