There are two principal ways to recruit workers: internally and externally. Most companies will actively use both methods, ensuring opportunities for existing employees to move up in the organization while at the same time fielding new talent. Depending on the time frame and the specialization of the position to fill, some methods will be more effective than others. In either case, the establishment of a comprehensive job description for every position for which the company recruits will help to narrow the scope of the search, and offer more qualified candidates, aiding in search efficiency.