CHANGANACHERRY SOCIAL SERVICE SOCIETY (CHASS) is the official organ of the Archdiocese of Changanacherry for social concerns and development interventions addressing the weaker sections of the society irrespective of caste, creed or community. Besides the officialdom in the Archdiocesan setup, the Society has been granted NGO status under the charitable provisions of the Government Act (Travancore- Cochin Literary, Scientific & Charitable Societies Registration Act XII of 1955). Founded in the year 1966, the Society has always remained as a pioneering organization all the while in social innovations and research based rural development services.

The Society has a democratic set up having its General Body constituted of village representatives, parish priests, subject experts, and specially nominated persons by the chairman Archbishop. In this respect, the Society is built upon a substantial people’s organizational base at the village level; the important among them are Village Development.

Councils (Local Social Service Units), Mahilasamajams, Credit Unions, Self-Help Groups and Farmers Clubs. The Society has got a large operational area in the south and south central parts of Kerala, spread over 5 civil districts viz. Kottayam, Alappuzha, Pathanamthitta, Kollam and Thiruvananthapuram. The operational area is divided into 15 regions consisting of 164  local units for effective management and active involvement.