Organisations which offer structured gap year travel, work or volunteering in groups will often already provide some form of induction relevant to the projects, destinations, length of travel and activities to be under-taken.
Many people use these organised schemes as a launch pad for further independent travel; often completing a volunteering project and then setting off on their own to further explore the destination or other parts of the world.
This can leave participants with a gap in their training / induction and unprepared for their wider travel.