Delphi is a well-established technique that involves repeated polling of the same individuals, feeding back (sometimes) anonymised responses from earlier rounds of polling, with the idea that this will allow for better judgements to be made without undue influence from forceful or high-status advocates. The technique was developed so as to circumvent “follow the leader” tendencies of face-to-face exchanges, and other problems such as the reluctance to discard previously stated opinions. Ideally Delphi will feed back explanations for people’s initial decisions, so that participants can assess the strength of the case for “deviant” viewpoints; often this is only done to a limited extent, if at all, because of the effort required to produce, process and feed back this information.