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.
The show was originally based on a segment from ABC's Love, American Style titled Love and the Television Set, (later retitled Love and the Happy Days for syndication) featuring future cast members Ron Howard, Marion Ross and Anson Williams.