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.
Among the differences between the show's beginnings as the Love and the Happy Day episode on Love, American Style (1969) and its premiere two years later as a series is that the role of Howard Cunningham originally was played by Harold Gould instead of Tom Bosley and there was no Fonzie on that episode.