According to Terry, "The make-up of a job, its relation to other jobs, and its requirements for competent performance are essential information needed for a job evaluation. This information can be had by reviewing available background information such as organization charts (which show how the job in question relates to other jobs and where they fit into the overall organization); class specifications (which describe the general requirements of the class of job to which the job under analysis belongs); and the existing job descriptions which provide a starting point from which to build the revised job description". What does it mean by the comprehensiveness of this piece