A procedure in which one asks experts to describe, from memory, the steps they take in making decisions or forecasts. This can be used for developing expert systems, as discussed in Collopy, Adya and Armstrong (2001).
Collopy, F., M. Adya & J. S. Armstrong (2001),
"Expert systems for forecasting,” in J. S. Armstrong (ed.), Principles of
Forecasting. Norwell, MA: Kluwer Academic Press.