Testable software architecture in a nutshell

http://techblog.41concepts.com/2012/05/03/testable-software-architecture-in-a-nutshell/

1. controllability

2. objservability

3. automatability

The author said testability is the requirement from developers and testers not customers. So, the requirement of customers could conflicts with the one of developers and testers. For example, even if customers require much restricted security, it could limit the testing operations.