The preferred method of scaling, particularly when high-value logs are involved, is the 'roll out' method. In this process, the logs are unloaded from the truck and rolled out on the ground or on skids a single layer deep, so that the scaler can then see a good part of every log in order to assist in determining the number and size of defects such as bend or rot. Rollout scaling must be done where heavy machinery is available to handle the logs, and requires the space to do the rollout as well as the time and expense of the extra handling. Rollout scaling can be more efficient (at least for the trucks) as the trucks do not have to wait to be scaled and can be unloaded and leave immediately. This is in contrast with the ramp scale, where the truck must wait until the scaling is complete.