How many times has this happened? You open a job to your agencies and they begin submitting candidates. One by one you review the résumés, separating the candidates into “yes” and “no” piles, but quickly the flow of applicants turns to a trickle and the quality of candidates seems to stagnate--or even worse--decline. Your boss and HR is pressing you to fill the position and you throw up your hands, saying, "I need better agencies.” Your first reaction may be to put the job out to more…