Well, that was a longer break from blogging than I expected. I’ve had a tremendously busy winter, but hopefully I can get back to updating more frequently.
It’s not a quick read, but the short version is that DDL works quite well in general; there are very encouraging results and several medium-to-large effect sizes were found. Going forward there needs to be more fine-grained research on for whom, for what, under what conditions, and for how long does DDL work well. They also make some important points about what information needs to be included in the future by researchers doing quantitative work on DDL.