Attendees at the Asia-Pacific Psychology Leadership Forum, which took place at the International Congress of Psychology meeting in Yokohama, Japan, each became signatories to the Yokohama declaration.
After initial discussions in Japan, the constitution of the APPA was signed in Bali 2018 which marked the official start of the alliance. This was witnessed by then President of IUPsyS Dr Saths Cooper.
Representative countries include:
* Countries that were not represented at the signing
**ARUPS – ASEAN Regional Union of Psychological Societies