A rule is the specific application of a principle. Both principles are rules imply something established as a standard or test, for measuring, regulating or guiding conduct
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A scientific theory is an explanation of some aspect of the natural world that is substantiated through testing and observation. A scientific law is a statement that describes a consistent, natural phenomenon that has been observed repeatedly and has not been contradicted. A scientific principle is a basic truth or law that underlies a theory and helps explain how or why something happens.
Elements are things you can see.Principles are the rules, guidelines, philosophies, palettes, etc that guide the design.
what is the rules and responsibillities
Didactic principles are of fundamental nature i.e applicable in all situations whereas the didactic rules are observed in implementation of these principles and may be specific for different situations. for example there must be motivation at the starat of the lecture. This may be called a didactic principle. But what shoud be the characteristic of effective motivation? didactic rule will be observed for that.
Merit Principles are the "do's" and Prohibited Practices are the "don'ts"
A theory is a well-substantiated explanation of some aspect of the natural world that is based on a body of evidence. A principle is a fundamental truth or law that explains how a system works or how different variables interact. In essence, a theory explains why something happens, while a principle describes what is occurring.
authority: the power to determine, adjudicate, or otherwise settle issues or disputes; jurisdiction; the right to control, command, or determine. legitimacy: in accordance with established rules, principles, or standards.
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Merit Principles are the "do's" and Prohibited Practices are the "don'ts"
Substantive law establishes rights and responsibilities, outlining the legal rules governing conduct and behavior. In contrast, adjective law (also known as procedural law) sets out the processes and steps for enforcing substantive law, such as the rules for filing lawsuits and conducting trials.
"Principles" in this context are a set of empirical rules that makes something work. "Theory" would be a concept of how or why something works.