Job descriptions form a baseline understanding between the manager and the employee of the company’s expectations for the job.  Where job information is not adequately communicated, in reality, employees will perform those tasks that are easiest for them, which often are not the responsibilities that support departmental goals or career development.  Having accurate job descriptions, along with ongoing discussions between the manager and the employee on what is required of the job, will ensure a common understanding of job expectations, serve to challenge the employee professionally, and will lead to more effective performance management.