I think 3 can be a good match for that statement....
Answer:
Operational definitions
Explanation:
An operational definition is a definition that is used to define a procedure that is the researcher is going to measure some specific variables. The operational definition used in psychology by the researcher directly that what he wants to study, what he is going to measure under specific conditions.
Different definitions have different words that are going to be different because of different contexts. Different words have different meanings in a different context. These definitions are concrete and measurable.
Thus here Dr. Zimmerman's study on parenting style was controversial and other researchers want to replicate it want to is it reliable or not.
Different resources, different hardships.
