This session provides a point/counter point format on the debate between optionality vs. zero optionality as a best practice. Semantic interoperability of electronic health record requires consistent interpretation and adoption of technical standards. Standards with more optionality allow for more local customization of those standards that may ultimately impede interoperability. Conversely, standards that are too tightly defined may not be supported by existing information systems, thus disabling information exchange. Are we constraining innovation by imposing too rigid standards, or making things so loose that interoperability is harmed? Come hear the expert’s debate.