From 1915-1916 and 1917-1918, Malinowski did intense fieldwork on the Trobriand Islands, which helped him collect enough information to write multiple ethnographic reports. His most famous work about the Trobriand Islands, written in 1922, was "Argonauts of the Western Pacific". In this book, Malinowksi wrote about the Trobriand Kula Ring, a trade ring that enforced life-long relationships between neighboring groups. 