I don’t really think it’s unprofessional to say that; however, I do consider it unprofessional to ask such a question and expect a serious answer. If a person is not hired on the basis of such a question, even to a small extent, then if the person asks why she was not hired, she should be told the reasons. If the question isn’t a criterion for hiring, then it shouldn’t be asked.
Regardless, the question is out of line anyway, because it assumes a person’s traits are all work related, which is simply not reasonable. If, say, a person had been molested as a child and had an ingrained prejudice against whatever demographic the offender belonged to, then wanting to work through that prejudice is none of the employers business. The applicant is now in the position of refusing to answer, giving up information which the employer has no moral justification to ask for, or simply lying.
That example may be extreme; however, it should be obvious that there are myriad aspects of one’s person that is not something the employer has any business asking about. I’m shy with women, in terms potential romantic relationships (not professionally or in terms of friendship) and at this stage of my life, that would probably top the list of traits I’d like to improve on. Any future boss has no business asking me to reveal that in a job interview. So, if I go job hunting, and if I am presented with that question, what do I do?
Do I lie?
Do I tell the interviewer to butt out?
Or do I reveal something personal and unrelated to work?
Well, I lie. And since I’m lying about what I most want to change about myself, I’m not going to expose myself on the basis of a lie I’ve been forced into telling.
Another problem to be borne in mind is the fact that subjective judgments about a personal trait, even if it is work related, are far too poorly calibrated to be useful. I see myself as being semi-literate when it comes to computers; however, almost everybody I work with consider me to be knowledgeable with the contraptions. I think I’m bad at math, but (with some review) I could set up and solve a LaGrangian. I think I’m bad with people on the telephone, yet people imitate my telephone manners because they find them so charming. (I’ve left a string of people who now say “my pleasure” in response to a thanks.)
How is an employer possibly going to judge something for which there is virtually no possible way to functionally calibrate?
Given the terribly low correspondence between interviewing performance and job success, it’s a pretty silly question any way. Bear in mind that my sister has an MBA specialized in HR, has been an HR professional for something like 15 years, and aggressively seeks out new methods, theories, techniques, and knowledge to be better at her job. She extimates the correlation between interviewing and job success to be about 0.3.
IMHO, of course. 