CASTL: Carnegie Foundation ArchiveCASTL represented a major initiative of the Carnegie Foundation. Launched in 1998, the program built on a conception of teaching as scholarly work proposed in the 1990 report, Scholarship Reconsidered, by former Carnegie Foundation President Ernest Boyer, and on the 1997 follow-up publication, Scholarship Assessed, by Charles Glassick, Mary Taylor Huber, and Gene Maeroff.