The words "executive, senior executive, manager, assistant manager, and senior manager" are JOB TITLES and Job Classes that are apparently mixed up by your company. They are NOT job grades.
Job Grades refer to the hierarchy being used by companies in their salary structure. Job Grades may use numbers and/ or letters to represent the distinction between and among them. It is important in making sure that the salary rate ranges given to jobs do not result to distortion, i.e. the situation wherein small jobs are able to get higher salaries than bigger jobs.
In compensation, job grades can be correctly determined thru the use of Job Evaluation (JE). JE is the method used to determine the relative size of jobs within a company. Big jobs are usually given higher job grades while smaller jobs are given lower job grades.
19th August 2016 From Philippines, Parañaque