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.
Whether it was Sunday, Monday, or another day of the week, Happy Days had fans falling in love with a middle class American family living in the 1950s. From comebacks to catchphrases and catchy opening jingles, the show had everything, which is why -- three decades after the final episode aired -- we're still talking about it.