Whether to use job descriptions usually depends upon a number of factors, including employer preferences and resources. Employers should look at relevant rules and regulations, the size and type of organization and industry, hiring practices, and current employees.
Prepare job summaries, if relevant. You can use the job description template you use for each position that you advertise by filling in the template with the information that is relevant to that position. However, if you do (or expect to do) a lot of hiring of a particular position, you might make a special template that includes a summary of that job. This will save you some time.