Abstract: When emergency situations cross borders, or when newly formed groups need to work together, decision making can suffer from threat rigidity and pertinent information can be bypassed. We describe a Dynamic Delphi system under development that can create and sustain a group “voice” for an emergency response Community of Practice (CoP). We further describe its intended use for a CoP consisting of local, state and federal government responders, civilian emergency response teams (CERT), and volunteers. Community members can brainstorm, explore ideas, debate and vote iteratively to best reflect the group's opinion at any moment in time. Ongoing studies demonstrate that an online system implementing Dynamic Delphi characteristics along with Thurstone's Law of Comparative Judgment will prove conducive for building a repertoire of ideas, rules, policies or any other aspect of the community's 'voice', in such a way that the individual voices are juxtaposed in harmony to create a single song.