A comprehensive, web-based tool that allows clinicians to enter patient data, measure and analyze results, benchmark outcomes against the aggregate data, and publish findings. The purpose of Sustain is to maintain a prospective, longitudinal nutrition therapy patient registry in order to improve patient outcomes. In its initial phase, Sustain will collect data on patients receiving Home Parenteral Nutrition (HPN). HPN has allowed patients with intestinal failure a life-saving option to receive vital nutrients and some individuals have survived for more than 30 years on this therapy. Subsequent phases of this registry will allow expansion to other populations and therapies.