A job analysis is the process of defining what each job requires in terms of skills, tasks, and anything else that the job requires. This is a very important point for many reasons.
First, unless there is an accurate job description (based on an analysis), the company will not be able to recruit and hire the right person. In other words, you will need to know what the job is about before intelligently hiring someone.
Second, you also need an accurate analysis for potential employees. How will they know if they are qualified for the job, unless they know what the job will entail? Also how will they know if they even want to apply?
Third, when it comes to performance, a job analysis is important, because when a person is evaluated, they should be evaluated in view of the job analysis. In other words, did they fulfill their job description? Hence, any evaluation needs to have a job analysis.
Finally, a job analysis is important for other workers as well, so that each person will know what he or she is responsible for in their terms of tasks and duties.
In conclusion, one of the first steps is to have a job analysis in any company.