The Society

The Integrated Assessment Society (TIAS) is a not-for-profit-entity created to promote the community of inter-disciplinary and disciplinary scientists, analysts and practitioners who develop and use integrated assessment. The goals of the society are to nurture this community, to promote the development of IA and to encourage its wise application. TIAS members include scientists, practitioners and policy advisors from multiple sectors and from 23 countries around the world.

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About Integrated Assessment

TIAS defines Integrated assessment (IA) as the scientific “meta-discipline” that integrates knowledge about a problem domain and makes it available for societal learning and decision-making processes. Scientific and stakeholder knowledge is drawn from many disciplines and a wide range of methods are applied.

IA plays an important role in environmental management by providing integrated knowledge management tools and processes for addressing complex environmental problems, and for promoting transformations towards sustainable development.

IA News

TIAS News, April 2026, IA-related publications and events
December 2024 Newsletter – Feature: Assessing the climate resilience of cities, rural areas and river basins
April 2024 Newsletter – Feature: Envisioning transformative futures for water management
TIAS 20th Anniversary Symposium: Water issues and Integrated Assessment. Monday April 15
December 2023 Newsletter – Feature: We are all worldbuilders now – an offer of collaboration from the arts

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Send us your IA announcements: events, publications, etc. to profile on our website and/or in our quarterly newsletter. For more information on joining the global community of practitioners and scientists that use Integrated Assessment visit our membership page.

In memoriam – Marjan Minnesma

On May 22nd the Netherlands lost one of its greatest, most determined and optimistic champions for climate action and justice. Marjan Minnesma is well known internationally for the successful lawsuit she launched through Urgenda, the organisation she led for many years, to require the Dutch government to fulfill its legal obligation to reduce GHG emissions. But Marjan has done so much more which receives less attention and has also accelerated the climate agenda both in policy and in practice. This ranges from making energy-neutral homes more affordable for homeowners and accelerating electric mobility to introducing a national sustainability day and co-developing a vision, including a cost-benefit analysis, of how things can be done differently. Her work with Urgenda has also focused on biodiversity and the circular economy.

We, at TIAS, remember Marjan fondly from before her time with Urgenda, when Jan Rotmans, then vice-president of TIAS, brought us together to co-organize a conference on Challenges for Integrated Assessment in Berlin in 2005 (the closing conference of the European Forum for Integrated Environmental Assessment – EFIEA and first conference of TIAS).
Marjan will be missed by so many, but she has been and will remain an inspiration to all who know her work. What can we do to honour her legacy: continue to contribute to her vision, in whatever form.

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