If you are an employer and you want to make sure of your success; you have to make sure you'll be getting the right employees. Indeed, employees play a good role in making your company a success. When hiring, deciding persons to hire doesn't depend on the looks and information given to you by the applicants.
Even if the applicant has an impressing result on their exams and interview, these are just some qualifying procedures and it doesn't really assure an applicant that they qualify. One important thing that you shouldn't overlook in hiring an employee is conducting background checks.
This is the critical stage in hiring an employee, though the results of exams and interview are very impressing, an applicant should undergo background checks. This will determine if an applicant has a good track record from his/her previous employer. In background checks you can identify that applicant that has criminal records, court records. Of course if you are an employer you will not allow any person to work on your company if it doesn't have a good credibility.
If you will choose an applicant between an average person with good track record and intelligent with an attitude problem, you should not think twice in choosing the average person. Because you can still do some remedy with this kind of person through training but a person with an attitude problem will just give you headache and problem to his co worker.
So intelligence doesn't give you assurance to qualify in a job unless you have a good employment background so make sure to conduct background checks on your potential employees.