Our goal in developing DIAG-NLP1 and DIAG-NLP2 was to assess whether simple, rapidly deployable NLG techniques would lead to measurable improvements in the student's learning.
in both cases it is still DIAG that performs content determination, and provides to DIAG-NLP1 and DIAG-NLP2 a file in which the facts to be communicated are written -a fact is the basic unit of information that underlies each of the clauses in a reply by DIAG-orig.