Understanding of what actually happens in the system. An expert can quickly evaluate a project and because of his/her background, almost immediately understand cause/effect relationships and the probable level of service. The operators and supervisors often do not see things the same way. It is very helpful to install simple dataloggers and water level sensors at key locations to record spills, flow rate fluctuations, and water level fluctuations. This is almost always an eye-opener for operators who can only visit a location once per day.