What type of requirements elicitation technique is the Delphi Technique?

The Delphi Technique is classified as a survey-based elicitation technique because it uses sequential rounds of anonymous written questionnaires distributed to a panel of experts. Responses are compiled and redistributed across rounds until group consensus is reached, making it a structured form of survey rather than any type of real-time group interaction.

A workshop involves bringing stakeholders together in a facilitated real-time group session, whereas the Delphi Technique relies on anonymous, asynchronous written rounds with no direct interaction among participants.

A round table involves open direct discussion among participants in real time, which is the opposite of the Delphi Technique's anonymous and iterative written format.

Prototyping involves creating a working or visual model of a solution to gather feedback, which is unrelated to the Delphi Technique's questionnaire-based consensus process.