The editorial team of Evidence & Policy is pleased to see the publication of our fourth and final issue for 2025, Evidence & Policy Volume 21: Issue 4. This issue has a lot of work focused on how political elites use and are impacted by evidence in the policymaking process. A major thread through this work is that while evidence has an impact, there are important limitations.

The first piece examines programs designed to support scientists and engineers in engaging in public policy, specifically studying the state of Virginia. Through surveys and interviews of program leaders, the study finds evidence of perceived impact, though limits in the ability to implement evidence-based approaches.

The second article also finds impact and its limitation, but this time using policy documents. They find that policy think tanks draw from academic expertise more readily than governments.

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