Under good conditions it is commonplace nowadays for a well qualified crane and rigging company to send out a 140 ton capacity crane with a truck load of rigging gear and tilt up a warehouse of thirty or more panels 40 feet high and 30 feet wide in one day. This amount of work can be done only if the crane and rigging company or erection contractor has thorough prior acquaintance with the job and adequate preparation for it. The normal panel job, if such a thing exists, requires a minimum of three trips to the jobsite by the crane and rigging supervisor. The purpose of the first trip is to determine: the type of job, the size, the thickness and weight of panels, in which direction the panels will be laid, and access conditions. On the second trip, the erector goes over the layout at the jobsite in detail with the general contractor or the concrete contractor. On the third and final chick before erection day, the layout is rechecked for any hidden problems which were not there previously. The erection crew consists of the crane crew, rigger foreman, and two journey men riggers. On a standard job the contractor supplies the bracing and bracing labor. All rigging gear from the lifting lugs or pickup points on up is furnished by the erector. The sizing of the crane is determined by the weight of the panels, the method in which they are cast and whether or not the panels are cast on the slab and the distance they have to be traveled or hauled. In sizing the crane it is also important to pay particular attention to the height of the panel and the rigging required to erect it. One of the major interests in tilt-up construction is the cost of doing the job. Many factors are involved. The size of the crane is the first. Normally the size of the crane is determined by the largest panel. The availability of equipment and men affects cost. Trained personal are needed to operate the cranes and to run the rigging job. The location of the rigging company or crane equipment that is going to do the job is also very important. It may be better to spend money stacking panels or doing other work on the job than to make a number of trips back and forth with a crane. Access at the jobsite may affect cost significantly. It is very possible that the jobsite access will require a much larger crane than the panels themselves would justify. And the number of corner or reverse panels can make a considerable difference in cost. It will usually take twice as long to set a corner (the two panels in a corner) as to set two normal panels in a wall.