The process of developing job descriptions often sheds light on the nature of a job as well as suggests that there are alternative methods of performing essential job tasks. Job analysis may help encourage management and staff to work together in identifying and streamlining the essential and marginal job functions.
Of course, the job description should specify education, previous job experience, certifications and technical skills required for the role. You may also include soft skills, like communication and problem solving, as well as personality traits that you envision for a successful hire. While you may be tempted to list out every requirement you envision for your ideal hire, including too many qualifications and skills could dissuade potential candidates.