# Real-world effectiveness
> Real-world effectiveness measures how well a treatment performs in routine clinical practice, outside the controlled environment of clinical trials.
Source: https://www.visfo.health/glossary/real-world-effectiveness
Updated: 2026-06-16T15:10:40.108914+00:00

What is real-world effectiveness?
Real-world effectiveness evaluates a treatment’s impact on health outcomes when used in everyday practice, accounting for patient diversity, comorbidities, and adherence patterns. It is typically assessed using real-world data sources such as electronic health records, claims data, or observational studies.
Why is real-world effectiveness important in evidence generation and access?
It provides insight into how a product performs in uncontrolled settings and across broader patient populations. This supports payer discussions, guideline inclusion, and comparative effectiveness analyses. Demonstrating real-world effectiveness is often key to long-term product adoption and success.