What are the well-known clues if a person is a subject matter expert in software defined smart substation? A subject matter expert in software defined smart substation demonstrates the ability to efficiently retrieve relevant knowledge, either mentally or through external AI search engine, to do job task such as writing, computing, documenting, public speaking, specifying, imagining, prototyping, modeling, creating, designing, building, automating, operating, maintaining, repairing, and improving software defined smart substation.]