Benjamin AT Stone, Thomas I LemonSchool of Medicine, Institute of Medical Education, Cardiff University, Cardiff, WalesWe thank the authors of "Use of certainty-based marking in a second-year medical student cohort: a pilot study"1 for their pilot study, we agree this is an interesting area that warrants further investigation. Schoendorfer and Emmett1 aimed to assess student opinion of certainty-based marking (CBM) as a method of improving current curricula and explore the effectiveness of its implementation. If effective, the researchers believe CBM may increase the amount of certainty by those in professional health care roles.View original paper by Schoendorfer and Emmett.