Science is the system of knowledge covering general truths or the operation of general laws concerned with the physical world and its phenomena Logic is the science that deals with the principles and criteria of validity of inference and demonstration : the science of the formal principles of reasoning Theory is a system of ideas intended to explain something, especially one based on general principles independent of the thing to be explained. What ability, resistance or state of being would be given to a character that are outside of, absent from and/or unaffected by the systems and principles of Science: which governs the general laws of the physical world and all it's phenomena Logic: which governs the reasonings behind how all things in the world can occur Theory: which governs the explanation behind all things