While Remembering the Kana is regarded by some as having some flaws (some have criticised how it teaches katakana, and I've noticed a few inconsistencies or errors in the book that a proof-reader could have detected), there are plenty of language learners who have unsuccessfully tried learning kana using other resources, and have attributed their success with learning kana to Remembering the Kana.
The book does a lot of things differently from lots of other kana books. There's no tracing of letters. It uses mental pictures, but no physical pictures. You don't learn the letters in alphabetical order. You don't even go through the book in page order. It tells you how many letters to learn in a single session. The list goes on.
For those who have success with this book, what aspects of the book, or even a placebo effect, make it more effective, and what aspects have no effect or possibly make the book less effective?
Ideally, the answer should be backed up by research and not rely entirely on the author of the book.
