Servants should according to the scriptural injunction, be appointed to offices for which each is competent. If you wish to achieve success, you should never appoint servants in offices higher than what they deserve.
कर्मस्विहानुरूपेषु न्यस्या भृत्या यथाविधि। प्रतिलोमं न भृत्यास्ते स्थाप्याः कर्मफलैषिणा॥