Matter Matters? WHO International Programme on Chemical Safety The Atlas of FFR Guided Percutaneous and the use of The Atlas of FFR Guided Percutaneous Coronary Interventions provides practicing physicians clear information to understand both the complexity of the technique and the correct way to apply it Thanks are due to the Scientific Committee of NATO and its Presi­ dent for a generous grant and especially to the head of the Advanced Study Institute Program and his collaborators for their constant help and encouragement The fourth part addresses the subjective level founded on the findings of psychologists and neurophysiologists all well known scientists