Tokyostyle, thanks for asking, I am fascinated by fluency-based training and I really want to apply this to my japanese learning. :-)
The main difference between training for speed and training for accuracy is what happens after the person reaches 100% accuracy. Typically with school and conventional training it stops there. They might go onto the next level of the subject, even if they take a really long time to answer the questions.
The problem is that fluency is not just accuracy, but also the ability to respond fast. Someone fluent in a language doesn't have to stop and think about the next word they want to say, they just speak normally. Fluency or mastery of a subject is basically accuracy and speed.
The idea behind fluency-based training is to track the
rate of response along with the accuracy. Basically, it involves training with a set of subject material until the rate of response and accuracy are both high, and then progressing onto the next set of the subject.
I think this could work well with an SRS. The SRS could track the rate of response and be more intelligent about the scheduling of the reviews. An improved leitner-system perhaps. Imagine if a person takes a minute to remember a kanji. It would be nice if that review came again much sooner in order to reinforce the remembering and to encourage a faster rate of response. Another bonus is that the SRS wouldn't need more than 2 buttons for 'yes' & 'no', this is because the rate of response indicates how easy the kanji is, removing the need for an 'easy' button.
There are also studies showing that people with a high rate of response and high accuracy retain the material far longer than people with low rates of response but high accuracy. I have a book that references several studies.
http://www.fluency.org/Binder_Haughton_Bateman.pdf gives a general overview of fluency-based training as well. There's also more papers at that site.
Edited: 2008-11-08, 3:44 pm