The ISEI has developed affiliation agreements with several independent organizations that focus on emotional intelligence with the aim of mutually benefitting each organizations purposes and goals. 

Currently ISEI has agreements with the following organizations: 

• Lithuanian Social-Emotional Learning Association; Vilnius, Lithuania
• Institute for Emotional Development; Warsaw, Poland
• Foundation for Developing Emotional Intelligence; Sofia, Bulgaria
• Emotional Intelligence Society of Australia; Perth, Australia
• Center for Emotional Intelligence; Ohrid, North Macedonia