In the real world, we do not always get to start with a clean slate. In the same way companies must use existing buildings, they must often use existing legacy systems. Trying to retrofit them later on is not impossible, but it is guaranteed to be more difficult and open up more opportunities for error. The only way to prevent failure is to plan for it, the authors of Staying Ahead call this designing for anti-patterns, or negative use cases. The result will be robust protection, which will build the foundation for continued cyber security improvements.”]
Source: https://securityintelligence.com/building-cyber-security-right-from-the-start/