The Portuguese Association for Congenital Disorders of Glycosylation and Other Rare Metabolic Diseases (APCDG), together with a CDG & Allies Professionals and Patient Associations International Research Network (CDG & Allies - PPAIN), launches a scientific, pioneering and international study entitled “CDG Journey Mapping”, which intends to know the journey of people living with Congenital Disorders of Glycosylation (CDG), and their families, and ultimately aims to improve CDG quality of life.