CHREST is derived from the earlier EPAM architecture, which was the first successful cognitive model, and the second ever learning algorithm implemented on a computer. The timeline is:

• Early EPAM (1959-1962): Developed by Feigenbaum and Simon Focusses on Verbal Learning
• EPAM III (1963-1989): Major refinement of theory Still focus on Verbal Learning, but also Chess Reflections on the methodology of cognitive modelling
• EPAM IV and V (1995-1997): Extension to development of expertise Deliberate practice and strategic knowledge
• EPAM VI (2001): The last version on EPAM worked on by Simon Covers a wide range of data in verbal learning, memory, and concept formation
• CHREST (1992-today): Developed by Fernand Gobet
  1. Chrest 1: written by Fernand Gobet whilst at Carnegie Mellon University
  2. Chrest 2: the main version used in previous simulations of chess expertise
  3. Chrest 3: an integration of memory and problem-solving, still focussed on chess
• MOSAIC: Model of syntax acquisition