A flowchart used for service process design is often referred to as a service blueprint. First, describe what the line of visibility on a service blueprint shows. Then, consider any service business that you are familiar with. Define what is meant by a poka-yoke, and describe at least one element of the service system that is an example of a poka-yoke (if the system does not have any examples of poka-yoke, suggest at least one that could be added.) Note: to earn full credit for this problem you must use an example of a poka-yoke in a service system, not a manufacturing system.