A sessional GP is an umbrella term for GPs whose work is organised on a sessional basis, as opposed to GP partners (also called GP principals) whose contract is generally for 24-hour care. The term was first coined by the National Association of Sessional GPs (NASGP), who at the time were called the National Association of Non-Principals (NANP). After consultation with their membership, it was perceived that the term 'non-principal' (which referred to any GP who wasn't a GP principal or partner) was a term that defined these GPs using a negative definition rather than a positive one.