Good governance is important for the successful functioning of any (scientific) organization. Over the past decade, IASC has kept to its Founding Articles while modernizing its operations. In establishing the new Secretariat, it was identified that many IASC processes are not fully documented or formalized. In recognition of this shortcoming, this Action Group formalized IASC guiding and procedural documents and provide recommendations to align them, fill gaps, and recommend updates to one unified IASC Handbook ver. 23 March 2020.