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I witness recruiting unfit staff, because thy done grate talk in interview, I see interviews can be sale market for people who are good in talking bad in performing
Try CBA model of interviewing to eliminate unfit staff recruitment. And if the candidate lacks good communication skills, create an environment for him/her to answer at own pace. If the job requires minimum communication standards, you may not have much options but to conduct interview at those desired level.
Apart from CBA, try Thinking Pattern profiling as well.