We believe it's the principle (or concept/idealogy) of identifying all stakeholders involved in the delivery of software and software services and optimising their organisational structure, working practices, processes and tooling to deliver higher quality software faster. Without it investments in those areas will yield limited results.
"Insanity is doing the same thing over and over again and expecting different results"
"Insanity is doing the same thing in different ways and expecting the same result”. Would you bake the same cake with the same ingredients using different instructions and expect to get the same cake?