System testing is basically a part of software testing and test plan should always contain specific space for this testing. To test the system as a whole, requirements and expectations should be clear and the tester needs to understand real time usage of application too.
The city of Milwaukee, Wisconsin was chosen as the location in which Happy Days was set. Tom Miller, one of the producers, grew up in Milwaukee. In addition, Milwaukee gave the show a midwest flavor that they thought would appeal to a broad-based audience.
Happy Days is a long-running ABC sitcom created in the '70s and based around '50s nostalgia. Fitting for a show which launched so many spin-offs, Happy Days actually originated as an episode of the Genre Anthology Love American Style, but also drew both cast and conceptual elements from the movie American Graffiti.