Open Space Technology (OST) is a method for organizing and running a meeting or multi-day conference, where participants have been invited in order to focus on a specific, important task or purpose. In contrast with pre-planned conferences where who will speak at which time will be scheduled often months in advance, and therefore subject to many changes, OST sources participants once they are physically present at the live event venue. In this sense OST is participant-driven and less organizer-driven. Pre-planning remains essential; you simply need much less pre-planning.