event 01 Mar 2023

WEF Nexus Tool // Transboundary Nexus Assessment (TBNA) Methodology Interactive Infographic

In transboundary settings, Nexus related issues can result in painful trade-offs and friction between countries. The TBNA Methodology is a participatory approach to facilitate cross-sectoral cooperation in transboundary basins. The interactive infographic simplifies the six-step methodology.


The Transboundary Nexus Assessment (TBNA) methodology can assist countries seeking to initiate, broaden or revisit transboundary cooperation across sectors.

It is a flexible framework that can be adapted to enhance existing processes of cooperation. It was developed through an iterative process of consultations and learning by doing involving 300 country officials, experts and key stakeholders.

It enables policy makers and other stakeholders to identify positive and negative links, benefits, trade-offs, and solutions between relevant sectors.
The resulting insights can help reinforce national efforts to optimise resource use, improve policy coherence towards crosscutting objectives like climate action, and share benefits from coordinated projects.


The TBNA methodology responds to six principles: A. Participatory process; B. Local knowledge mobilisation; C. Sound scientific analysis; D. Capacity building; E. Benefit sharing; F. Transparent exchange of information.

Click on the interactive infographic below for a guided step by step understanding of the TBNA Methodology - including links tools, downloads and links to further information.

By applying the TBNA methodology countries can:

  • Enhance water, energy and food security in riparian countries
  • Boost regional and basin level climate adaptation and mitigation efforts
  • Foster transboundary cooperation across sectors
  • Reduce negative intersectoral or environmental impacts
  • Make policies more coherent to achieve the Sustainable Development Goals
  • Capitalise on regional complementarities of natural resource endowment
  • Improve natural resource use and governance across sectors

Who can participate in the TBNA process?

  1. Country authorities from relevant sectoral and cross-sectoral ministries (e.g. water, energy, agriculture, environment as well as finance, development, tourism, etc.)
  2. Basin authorities (e.g. River Basin Organizations)
  3. Regional organisations (e.g. sectoral, economic cooperation)
  4. International organisations (e.g. intergovernmental, financing institutions)
  5. Technical experts and analysts
  6. Community representatives

For a full overview of the Transboundary Nexus Assessment (TBNA) Methodology please

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