I have an oracle query in which and i want the result to be in custom order 'SENIOR DIRECTOR', 'DIRECTOR', 'MANAGER', 'EMPLOYEE' which is from the field GRADE_DESCRIPTON. I am using the below query.

However I am not getting the desired result The order of the result im getting is 'SENIOR DIRECTOR','MANAGER', DIRECTOR,'EMPLOYEE'

SELECT DISTINCT GRADE_DESCRIPTION, HIRING_FORECATS.*  FROM GRADE_MASTER left join     IRING_FORECATS ON (HIRING_FORECATS.GRADE = GRADE_MASTER.GRADE_DESCRIPTION and HIRING_FORECATS.LOCATION = 'HO' )   order by decode(GRADE_MASTER.GRADE_DESCRIPTION, 'SENIOR DIRECTOR', 'DIRECTOR', 'MANAGER', 'EMPLOYEE')

Any Suggestions??