The reason why not have a D grade and E grade because since the past year of 2558 (2015) employees at E grade patch development performance, which is a hardship to the employees.
Why not ask for a grade D and E since 2558. Past employees at Grade E to improve program performance. The difficulty with staff is huge.
Why not have a D grade and 2558 E due to years past employees at the grade E need a program to improve the development performance. Which is very difficult to staff