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 was a top 20 series for eight of its 11 seasons. Happy Days was the number one rated show in America during the 1976-77 season with a 31.5 rating. Laverne & Shirley would finish second with a 30.9 rating. Happy Days would appear in the top 20 several other seasons during the shows run.