ISEAS-Yusof Ishak Institute - The ISEAS–Yusof Ishak Institute is a leading research centre dedicated to the study of socio-political, security, and economic trends and developments in Southeast Asia and its wider geostrategic and economic environment.. The ISEAS–Yusof Ishak Institute is a leading research centre dedicated to the study of socio-political, security, and economic trends and developments in Southeast Asia and its wider geostrategic and economic environment.