International Association for Impact Assessment (IAIA) is "the leading global network on best practice in the use of impact assessment for informed decision making regarding policies, programs, plans and projects."
In the IAIA Fact Sheet #1, Impact Assessment (IA) is described as follows:
The International Association for Public Participation (IAP2) is an international organization "...advancing the practice of public participation.‘Public participation’ means to involve those who are affected by a decision in the decision-making process.
The International Centre for Complex Project Management (ICCPM) has a membership program and a LinkedIn discussion group. The focus is on improving the international community’s ability to successfully deliver complex projects.
The International Network for Interdisciplinarity and Transdisciplinarity (INIT) is a network of networks and "seeks to provide an international platform for discussion and promotion of interdisciplinary and transdisciplinary research, teaching, and policy." INIT aims to "facilitate communication and collaborative work among organizatio
The International Society for Ecological Economics (ISEE) is "dedicated to advancing understanding of the relationships among ecological, social, and economic systems for the mutual well-being of nature and people."
The International Society for the Systems Sciences (ISSS) is "devoted to interdisciplinary inquiry into the nature of complex systems." It is "broadly inclusive". The scope of ISSS includes "purely theoretical and technical considerations", as well as "practical application of systems methodologies to problem solving.