Leaders and policymakers in West Africa have been consistently expanding how they draw upon evidence and inform their decisions. To help policymakers in their evidence journey, 3ie’s West Africa Capacity Development and Impact Evaluation (WACIE) program offers various services, including a helpdesk. Managed by our secretariat in Benin, it produces rapid response briefs—drawing on evidence from systematic reviews—to answer questions posed directly by policymakers. In response to questions from policymakers in Côte d'Ivoire, we published briefs on the effects of various water, sanitation and hygiene (WASH) interventions on nutrition.

Do access to latrines and other WASH interventions reduce child malnutrition?
We find that the provision of improved latrines does not show an effect on malnutrition. But the transition from open defecation to the use of sanitary facilities decreases stunting. Read the brief [English, French] to know more about the findings and key recommendations.

What is the effect of water source improvement on malnutrition and the prevalence of waterborne diseases?
While several studies show that access to safe water has no effect on malnutrition, we find that access to WASH interventions combined with nutrition interventions increases the height and weight of children under two. Read the rapid response brief [English, French] for other key findings and recommendations.
Mapping evidence on irregular migration
Hundreds of migrants remain missing and feared dead in one of the largest shipwrecks – on 14 June – in the Mediterranean in several years. This latest tragedy has revealed urgent policy needs to facilitate safe and orderly migration. Poverty, lack of economic opportunities, conflict and violence, political instability, and climate change force people out of their homes and countries – many of whom end up resorting to unauthorized movement that is outside the laws. While interventions seeking to address the root causes of irregular migration have grown, there is limited evidence of their effectiveness. Further, there is an absence of research that examines the existing evidence base, which means we do not know which interventions effectively address irregular migration and risk factors.

3ie’s ongoing research supported by United States Agency for International Development (USAID) and International Organization for Migration (IOM) aims to map the evidence to fill essential knowledge gaps on the effectiveness of programs addressing the root causes of irregular migration and synthesize results so findings can be utilized by policymakers and practitioners in Guatemala and globally.

If you know of a study or have ideas that might be relevant to this EGM, please contact Daniela Anda ( We are accepting study suggestions until 15 July 2023.

Read blog | View webpage
15 years: Expanding and diversifying our reach and services

Over the last 15 years, 3ie has continued to support, produce and advocate for the use of evidence in decision-making. To demonstrate the range and breadth of our work, to improve transparency and accessibility, and to showcase our approach, we’ve made a number of upgrades to our website:
  • Snapshot of our work: Explore our interactive data visualizations to get a snapshot of how evidence supported and produced by 3ie has evolved over time, where the studies are situated, and where we have been able to document the impact of our work, among other things. View at a glance.
  • Delivering customized services: From unpacking a development problem to understanding the effectiveness of your project or its impact, our experienced staff can deliver a variety of services to support evidence-informed action across the development programming cycle. Explore our suite of services to know how we can facilitate your evidence journey.
  • Improving access to evidence: As part of our resolve to make evidence accessible and strengthen evidence-informed decision-making, we continue to expand and upgrade the Development Evidence Portal to respond to your evidence needs. A contribution from your side could help offset the considerable costs we incur in doing so. Here’s how you can support us.
Living Food Systems and Nutrition Evidence & Gap Map: New gaps identified

We have launched our fifth update to 3ie’s living food systems and nutrition evidence and gap map (E&GM). It includes over 2,300 studies and presents a rich body of evidence, including the latest research. It reports on evidence from all key areas and intervention types and identifies potential primary and synthesis evidence gaps. The fifth update comes shortly after the publication of our mid-term report. Here are the key takeaways:
  • Three additional evidence gaps identified based on interventions include cold chain initiatives, farm-to-market transport, and food safety regulation
  • Of the five outcomes that are considered evidence gaps, some have not had any new studies identified during the living period
  • Food loss and economic, social, and political stability are the least measured outcomes
  • Most updates have identified some new women’s empowerment outcomes
  • Few high- or medium-confidence systematic reviews have been published
  • Only one systematic review focused on agricultural insurance products despite 31 evaluations of the intervention.
For a complete lowdown of the findings, read our latest blog. Starting with this update, the map will be expanded to include interventions and outcomes considering gender transformative approaches and social protection. We are also leveraging it to produce a series of evidence-synthesis products. Read more

View living EGM | Read note on update #5 (July 2023) | Read mid-term report
Visit Evidence Matters blog site to view all posts.
Upcoming events
What Works Global Summit 2023
17-20 October 2023
The What Works Global Summit (WWGS) will bring together researchers, leaders in evidence-based decision making and practitioners to share the latest evidence synthesis research, research methods and practice strategies for improving the lives of individuals, families and communities worldwide. WWGS 2023 will be an in-person event taking place in Ottawa, Canada and co-hosted by the Campbell Collaboration and the Bruyère Research Institute.  Read more

Plenary: Evidence for the Sustainable Development Goals
Birte Snilstveit, Director of Synthesis and Reviews and Head of London office, 3ie; Daniel Ortega, Director of Impact Assessment, Development Bank of Latin America – CAF; Deborah McWhinney, Evaluation Advisor/Lead, Meta-Synthesis Team, United Nations Population Fund; Kerry Albright, Deputy Director and Principal Adviser-Evaluation, United Nations Children's Fund (UNICEF); Shivit Bakrania, Evaluation Specialist, United Nations Development Programme
Register here   
Past events

3ie at ANH Academy Conference 2023
27 - 30 June 2023 | Lilongwe, Malawi and online
At the ANH2023 conference, 3ie staff presented on several important topics, including rapid evidence for agriculture, nutrition and health policy decision; fiscal policies in nutrition, long-term effects of agricultural systems interventions as well as impacts and processes of food systems programs. Read about the 3ie sessions

Does WASH programming contribute to additional development goals?
29 June | Online
In this panel discussion, 3ie staff presented our innovative outcome-to-outcome WASH systematic map which seeks to go beyond the effects of WASH on health to understand the research base on the associations between achieving intermediate WASH outcomes and high-level development outcomes in low- and middle-income countries. Nikki Behnke from USAID, who supported the project, observed that the map was a good start to explore the avenues for further research.
Carolyn Huang, Senior Evaluation Specialist, 3ie
Nikki Behnke, Program Specialist, USAID
Sridevi Prasad, Senior Research Associate, 3ie
Heather van Buskirk, Research Associate, 3ie

View recording here

Impact evaluation incubator on food security
Oslo, 26-28 June

Norad, in collaboration with The Development Learning Lab, and 3ie organized an incubator for organizations that have progressed to the second stage of Norad’s call on food security. Apart from presentations on an overview of the evidence on the effectiveness of food security interventions, researchers and practitioners from different organizations worked closely to prepare for an impact evaluation of the project the organizations have proposed for Norad’s call. The main goal for these incubators is to help organizations learn how to design and conduct high-quality evaluations that can help them succeed in reaching the goals of their projects. State Secretary Bjørg Sandkjær, Ministry of Foreign Affairs gave the welcome remarks.
Resilience Evidence Forum 2023
20-23 June | In person and online
The forum convened participants from the USAID, implementing partners, non-governmental organizations (NGOs), United Nations and international organizations, donors and Global South government officials, universities, private sector, community-based and research organizations. 3ie’s Miriam Berretta presented the latest Evidence Gap Map on Building resilient societies in low- and middle- income countries.
Join our growing and dynamic team by applying for one of these unique and impactful roles. View all the current opportunities here.