An auto repair garage tracks employees and vehicles. An employee may work on many cars and a car is worked on by one employee. One employee quit before working on any cars.

A local tech company keeps track of its customers and their jobs. A customer may have many jobs and a job belongs to one customer. A job requires one or more skills to complete $($for example, networking skill$)$; a skill, which is tracked by the company, may be used in many jobs. This is a M:N relationship $($job$-$skill$).$ For extra credit, "fix" the $M$:$N$ relationship.