Trading systems are the strategies all technical traders use to place their trades. However, any given system is only effective for a certain amount of time, under a specific set of circumstances. Therefore, to be truly successful, traders must change their systems on a regular basis. This text discusses the impermanence and built-in obsolescence of trading systems. The author explains, using a case example, how to create a profitable trading campaign that will work for a specific financial instrument under certain circumstances for a limited period of time. Then, the system is redeveloped for the next set of circumstances. The overall aim is that the campaign never becomes obsolete as the program is constantly adjusted to meet market changes.