We do a lot of coordination and planning and I should really do quite a bit more.  In general there are about three days of pre-production for every day of shooting.  The bigger the shoot, the more production days.  A few times a year we’ll take on a shoot that will take weeks to produce.  All of the elements need to come together, but usually we try to build in some measure of safety so that if one element fails, the entire shoot doesn’t collapse.  Sometimes you can’t do that, and you just have to hope for the best. Sometimes you just get lucky and it all works out.