ECTA has participants from many organisations and professions:

ALife Counselling Services
Association of Women For Research and Action
Changi General Hospital
Communicable Disease Centre, Tan Tock Seng Hospital
DBS
DP Architects
Drs. Bain & Partners
Drs. Koo, Neoh & Associates
ESPNSTAR Sports
HSBC
Hwa Chong Institute (College)
Institute of Mental Health
K N Chin & Associates Pte Ltd
KHOO Foundation
Ministry of Defence
Ministry of Education
Ministry of Foreign Affairs
Ministry of Home Affairs
Minstry of Community Development, Youth and Sports
National Healthcare Group
National Institute of Education
National Library Board
National Technological University
National Trade Union Congress
NTUC Club
Parkway Group Healthcare
PEACE Community Resources
Presbyterian Community Services
Prudential Assurance Co.
Raffles Girls' School
Raffles Girls' School
REACH Family Service Centre
Republic Polytechnic
Rotary Family Service Centre
Sincere Medical and Dental Clinic
Singapore Airlines
Singapore Anti-Narcotics Association
Singapore Anti-Tuberculosis Association
Singapore Customs
Singapore Institute of Management
St. Hilda's Secondary School
Tampines Family Service Centre
Temasek Polytechnic