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A [[Method|method ]] ceases to be employed only when other methods that are incompatible with it become employed. By the First Law for methods, an employed method will remain employed until it is replaced by other methods. By the Zeroth Law, the elements of the [[Scientific Mosaic|scientific mosaic ]] must be compatible with one another. Thus, a method can only become rejected when it is replaced by an incompatible method or methods[[CiteRef::Barseghyan (2015)|p. 172-176]].

A method becomes rejected only when some of the theories, from which it followsbecome rejected. By the method rejection theorem, a method is rejected when other methods incompatible with it become employed. By the Third Law, this can happen only some of the theories from which it follows are also rejected[[CiteRef::Barseghyan (2015)|p. 177-183]].