A principle is defined as a normative property of all systems in a given context, or the way in which they are realized.
Principles define intended properties of systems. A principle defines a general property that applies to any system in a certain context. A principle is motivated by some goal.
Motivation
"Systems should be customer facing", "Customers should have a great experience", "Colleagues should be informed"
Composition, Aggregation, Specialisation, Influence