Difference between Theories of Principle and Constructive Theories According to Lee Smolin

The difference between theories of principle and constructive theories, according to Lee Smolin
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Lee Smolin gives a clear difference between theories of principles and constructive theories. According to him, the principle theory lays a framework that makes a description of nature possible. Unlike constructive theories, the principle theories must always be universal by definition, and this means that all their components should be the same in propositions and conclusions. Relativity and Quantum Mechanics are examples of theories of principle.
On the other hand, constructive theories explain specific phenomena with certain models and equations. Examples of constructive theories are the theory of electrons and the theory of the electromagnetic field. These constructive theories cannot stand alone, and instead, they are placed within the principle theories. This means that the constructive theory ...