As job description document provides the information about the job so in order to prepare this document detailed information is require about the job title, job duties, job responsibilities etc. the information relating to all these things can be collected from the following methods:

1) Discussion with the employees working on the job.

2) Discussion with the supervisor of the job.

3) Requesting the employees working on the job to fill the questionnaire describing the job.

4) Requesting the supervisor of the job to fill the questionnaire describing the job.

5) Observation of the job how it is performed also help in collecting the information relating to the job.

The above are the methods of preparation of job description document.