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One of the answers above says that the candidate must learn to express themselves. Jacqueline said "It is survival for the fittest" . . . . that is true, but sometimes we take that sentence and overuse it.
As the question suggests, the candidate's skill-set is clearly apparent, and the candidate lacks the ability to demonstrate said skill-set and aptitude. Unless the job specifically requires the skill of clearly expressing oneself, the candidate does not need to learn how to express themselves. For example, if this is a role where the candidate is able to work in a silo, producing a lot of work without much need to clearly express ideas to teammates, then the skill of expressing does not rest solely on the candidate.
We have to give a bit more responsibility to the interviewer. If the candidate is not able to express themselves in one situation, then the interviewer should adopt other methods of assessing the candidate's skills. Some humans are good at expressing themselves verbally, others excel at written expression, others excel at demonstrating expertise through actions or showing their problem solving skills. To truly asses your candidates, let's move past the ancient and inaccurate interview method of only asking verbal questions.
Adopt behavioral interviewing, try structured interviewing, panel interviewing, try out actual job scenarios and instead of interviewing the candidate, give them actual work. Have them present their findings. There are many ways to pulling out information from a candidate, than just simply saying to yourself that "the candidate must learn to express themselves".
I say as business professionals, we must learn to extract information from our future leaders.
HR shall reduce the tenses for the candidate not able to express more. The expression “it’s not what you say, it’s what you do” is never more true than during the interview Your body language can have a significant impact on how you’re perceived, and so you have to be aware the moment you step through the door. You have being judged even before you’ve uttered your first word, body langue show you're confident, smart, and enthusiastic, Only a small percentage of communication involves actual words:7%, to be exact. In fact, % of communication is visual (body language, eye contact) and % is vocal (pitch, speed, volume, tone of voice). Beside HR can conduct practical knowledge skill, then he can evaluate the candidate.