Operationist
An operationist is someone who believes that the validity of a concept or theory is determined by the specific operations used to measure or manipulate it. This approach emphasizes the importance of observable and measurable phenomena in scientific research and rejects the reliance on unobservable entities or abstract constructs. Operationists seek to define concepts in terms of the operations that can be performed to observe or manipulate them, grounding scientific theories in empirical evidence and concrete measurements.