Summary Richard von Abendorff, an outgoing member of the Advisory Panel of the Healthcare Safety Investigation Branch (HSIB), has written an open letter to incoming Directors on what the new Health Services Safety Investigations Body (HSSIB) needs to address urgently and openly to become an exemplary investigatory safety learning service and, more vitally, how it must not contribute to compounded harm to patients and families. The full letter is attached at the end of thi