Delphi is a method for obtaining group judgments on factual matters for which precise information may not be available, and on values for which information is a matter of opinion. This paper discusses different applications of the Delphi method to educational planning and attempts to evaluate its potential in resolving the particular needs of the educational planning process. The technique is described and explained, and specific areas in which Delphi could be used are considered. Examples of cases in which the technique has been applied are presented. Particular attention is paid to the kinds of actors or participants who are likely to be involved in each decision area, and the most suitable designs for a Delphi exercise are outlined for each case. (Authors)