In this respect, selection of personnel has "validity" if an unmistakable relationship can be shown between the system itself and the employment for which the people are ultimately being chosen for. In this way, a vital piece of selection is Job Analysis. An analysis is typically conducted before, and regularly apart of, the improvement in determination systems. Then again, a selection method may be deemed valid after it has already been executed by directing follow up job analysis and demonstrating the relationship between the selection process and the respective job.