While participating for several years in Japanese
classes at NIST, I developed
a way of practicing the writing and reading of
Japanese characters, which, with
the collaboration of Madoka Kikuchi Bernal, eventually
took the form of a manual.
Here's a preview of the manual.
--- Javier Bernal
Preview of Japanese Manual, Volume I, Part 1 (Romaji)
Preview of Japanese Manual, Volume I, Part 2 (Japanese)