The treatment and organization of the historical archive of the Olympic Committee of Portugal started in late 2013. From an early stage it was possible to realize that historical and fundamental documentation for writing the history of the Olympic movement in Portugal was missing. The oldest documentation found refers to two letters dated 1915. With the priority of creating an interdisciplinary team and with extensive and recognized knowledge in the area of archiving, a protocol was signed with the Institute of Contemporary History. Thus, the overall coordination of the project was under the responsibility of the COP, having the IHC the scientific and technical coordination.