A short-term mission (STM) is the mobilization of a Christian missionary for a short period of time ranging from days to a year; many short-term missions are called mission trips. The short-term missionary is a fairly recent innovation in the global missions movement, but many short-term missions agencies are seeing an increased number of trips that consist of a week up to a year. The project approach has matured in the modern Short-term Missions (STM) movement and become a standard annual feature for thousands of Christian youth groups, church groups, and individuals across the United States.