Which scale of measurement is being used if assigning numbers based on different professional affiliation (e. g., counselors, social workers, psychologists, psychiatrists) ?

Answer: The answer is Nominal scale

Step-by-step explanation:

Scale of Measurement refer to ways in which variables/numbers/information are categorized

Nominal Scale is a measurement scale, in which numbers serve as "tags", to identify or classify an object. it is usually use for non-quantitative variables. Some examples of variables that use nominal scales are language spoken, sex, the football club you support, profession etc