On 1st August 1990, a new segment of teachers, the higher secondary teachers were generated. It was the first step of left Ministry‘s plan to separate Pre-degree from the University education and to start Senior Secondary course. The commission headed by Sri Romanas Ora IAS submitted the report with various sketches to launch the Higher Secondary Institutions in Kerala. It was a revolution in Kerala Education arena, when the Senior Secondary course in Government sector started. Afterwards senior secondary course has named higher secondary course. Passionately the Medias entitled this course as Plus Two. In the primary phase, 31 Plus Two schools were started in 31 education districts. Single batches of 60 students were admitted in each school. 15 schools with Humanities and 16 with Science group started under the supervision of DPI. Then DPI started assigning teachers according to seniority and suitability. On October 1990 the Senior Secondary Directorate was formed to organize the Plus Two level.
The state wise higher secondary school teachers association was fashioned on the 9th of February 1991. The association of Higher Secondary School Teachers conducted meetings on September 1990 at Ernakulam and Calicut demanding the higher secondary directorate for special pay scale and course intensification. By coordinating the south and north members the statewise organization of Plus Two Teachers was formed on 9th of February 1991. The first meeting was held at SRVLPS Ernakulam. Thus the great harmony of Higher Secondary School Teachers, HSSTA, was originated..
The Departmental Higher Secondary School Teachers Association is the vanguard of the Government Higher Secondary School Teachers movement in Kerala. Having the distinction of being the only recognized organization of the Government Higher Secondary School Teachers of Kerala; it is steadfastly committed to its objectives of taking up the cause of the fraternity of teachers of Higher Secondary sector. HSSTA is unflinching in its efforts to make quality education accessible to all especially the marginalized sections of our society. Reinvigorated with the induction of most of the new generation teachers in the field, the Association is poised to advance its position on the bandwagon of change : educational, cultural, social and political.