Trustworthy, evidence-based health guidelines form the basis of national policies affecting both patients and health-care workers. Emphasizing the link between robust evidence and people’s trust in their health systems, Dr Hans Henri P. Kluge, WHO Regional Director for Europe said at the launch event, “Trust and transformation are key words for us, especially when we talk about improving and strengthening our health systems. Transformation should first and foremost serve the interests of patients and health-care workers”. While it is not always easy to demonstrate the immediate effect of guidelines on people’s health, there is no viable alternative to utilizing guidelines based on the best available evidence. Yet, developing robust guidelines remains a challenge for most countries. “Guidelines need to be both simple to use and timely, they need to address people’s real needs, especially at the local level, and should ultimately reflect the resources available,” said Dr Natasha Azzopardi-Muscat, Director, Country Health Policies and Systems, WHO/Europe. “This means that any successful guideline needs to be adjusted and adapted to local contexts and realities.”