Personally, I don't expect much from the data. From reading through scores of papers comparing minute differences in spacing and getting contradictory results and small improvements, I get the impression that once you've moved from massed to spacing (almost any kind of spacing), you've gotten the overwhelming majority of the benefits, and the rest is basically frippery which needs a lot of domain expertise to improve upon. I understand Peter hasn't looked at the Mnemosyne data much either because it didn't indicate to him that the fancier SuperMemo algorithms were much help.

What do you think are the prospects of a SRS that uses a forgetting curve specific to the individual, by relying on past performance? Has this been tried or considered?