After finishing the job analysis the next step is to elaborate the job description.

A job description is a written statement of  what a jobholder actually does, how she/he does it, and under what conditions the different tasks of the job are performed.
You should use the same job description form in the entire organization. It gives you an overview about the realtionship of different jobs, you can process the data the job descriptions contain, and you can keep them up-to-date more easily.

The usual content of a job description:

• the goal and function of the job
• job identification: job title, job code, date, location, immediate supervisor's title, and grade/level if there is any
• authority of incumbent (position within the hierarchy): defines the limits of the jobholder: decision-making authority, direct supervision of others, budgetary limitations
• job summary
• responsibilities, duties
• job relationships, inside and outside the organization (reports to.., supervises.., works with.., outside the company...)
• substitution
• "written by" approved space  
• signature of the jobholder
  

You can put into the job description a "standards of performance section" if you do not use a separate job specification form.
This states the standards the employee is expected to achieve:
   - level of education, professional knowledge
   - work experience   - skills and abilities
   - other expectations such as "We will be completely satisfied with your work, when...."

At the moment the organization approve and accept the created job description form it must be filled up with the appropriate content for each type of existing jobs.
It is the responsibility of the HR to create the form, to get the management's approval and inform the organization how to use the forms.
HR provides for each job the data for the job identification section, (job title, job location etc...) but all other content comes from the line managers, (job summary, authorities etc...) and at the end of the process the form returns to the HR, who controls and gets the signatures needed. They make three copies of it, one for the jobholder, one for the line manager, and one stays in the archive of the company.

Vide: Job description downloads!

Job description sample 1
Job description sample 2