Best boy

In a film crew there are two kinds of best boy: best boy electric and best boy grip. In the simplest forms, they are assistants to their department heads, the gaffer and the key grip, respectively. On films with very small crews, the electric (lighting) department often consists of only a gaffer, a best boy, and a few electrician. The grip department may include only a key grip, a best boy, and a few grip. On very large crews these numbers can hit up to 12 or 24 grips or electricians per department and include full time rigging crews and additional photography units, depending on the situation. Best boys are responsible for the daily running of the lighting or grip department. This encompasses many responsibilities including hiring and scheduling of crew, the ordering and returning of lighting or grip equipment, workplace safety, timecards, expendables, loading production trucks, planning and implementing the lighting or rigging of locations and/or sound stages, coordinating rigging... full article at wikipedia