1. The issues raised in all the writ petitions are common in nature. Therefore, the same are being disposed of by the following common Order. The writ petitions are Secondary Grade Teachers Aided Schools, Secondary Grade Teachers Association, Private Aided Primary Middle School Managers and Teachers Association. Generally the petitioners have sought for directions by calling for the records relating to the following Government Orders issued by respondent/Government of Tamil Nadu and consequential Order of Director of School Education:

(1) G.O.Ms.No.1524, Education, dated 12.11.1990,

(2) G.O.Ms.No.1669, Education, dated 13.12.1990,

(3) G.O.Ms.No.20, Education, dated 8.1.1993,

(4) G.O.Ms.No.494, Education, dated 19.5.1993,

(5) G.O.Ms.No.279, Education, dated 9.4.1996,

(6) G.O.Ms.No.5, Education, dated 6.1.1997 and

(7) G.O.Ms.No.365, School Education, dated 20.8.1997.

As stated earlier all the contentions in these writ petitions are identical and common in nature. For the convenience, I shall refer the case of the petitioners in W.P.No.221 of 1991. The first petitioner in that writ petition, who is a secondary grade teacher, was appointed as secondary grade teacher on 20.4.1