The Delphi method is used to promote participation and consensus through iterative anonymous surveys from stakeholders and experts. It allows the sharing of alternative views on an issue in order to reach an optimal solution while lessening psychological bias.
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Problems and Purpose
"The Delphi technique is an alternative participatory method. Although it is based on iteration and feedback, it is less elaborate and resource‐intensive than Deliberative Polling. In addition, unlike Deliberative Polling, the Delphi technique eschews face‐to‐face discussion in favor of repeated anonymous surveys. The rationale for removing face‐to‐face discussion from a group decision process is that group dynamics can stifle creativity, inhibit dissent, and prevent all aspects of an issue from emerging." 
Origins and Development
Participant Recruitment and Selection
How it Works: Process, Interaction, and Decision-Making
Influence, Outcomes, and Effects
Analysis and Lessons Learned
 2009 report "Area F Horse Control Strategy." http://tinyurl.com/y6zckr9l [dead link]
Source documents can be found at http://is.njit.edu/pubs/delphibook/ [dead link]
Similar content at https://web.njit.edu/~turoff/Papers/delphi3.html and https://web.njit.edu/~turoff/pubs/delphibook/index.html
Brydon, Michael. "A Proposed Horse Control Strategy." Last modified May 14, 2009, http://areaf.rdos.bc.ca/cms/comment/8
Lead Image: Delphi Technique http://tinyurl.com/yyuxr2ot