How To Write Job Responsibilities . Create a strong and concise (usually a couple of sentences) summary of the new position. As you write roles and responsibilities in a job description, reflect upon a day in the life of the employee who will read this document. How To Write A Good Job Description Business 2 Community from www.business2community.com Job descriptions can be written as a joint effort between supervisor and employee, but the supervisor must approve. Begin phrases or sentences with verbs. Create a strong and concise (usually a couple of sentences) summary of the new position.