In each successive level, the dog-handler team is asked to negotiate obedience and protection routines that are increasingly complex and difficult in terms of pressure from both decoys and environmental distractions, and as well the handlers must strategize how to work through scenarios involving risk-reward tradeoffs.  As the scenarios can change from trial to trial in the upper levels, handlers must be able to train components of exercises, and pattern training is a virtual impossibility. The higher the levels, the more surprise scenario components in both obedience and protection are presented to the handlers.