The Delphi technique is part of the qualitative research techniques of consensus-seeking and allows analyzing the degree of agreement among experts on a specific topic. It takes its name from the Delphos oracle and owes its origin to the RAND Corporation, wherein in the 1950s it was used to make predictions about the probable consequences of a nuclear catastrophe.

To apply this technique, a number of experts of more than 20 are first selected and invited to give their opinions freely and privately (without contact with each other) on a particular subject. Typically, the experts give their opinions on issues identified in a previous phase of the study in successive rounds (also called waves). A minimum of two and a maximum of three waves are most common. In each of these waves, only those aspects on which there is the greatest agreement among the experts are selected for the following consultation. The assessments are always carried out autonomously, anonymously, and confidentially.

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