Here is link to interesting pdf document about developing reiho (ritsurei, zarei, ...) in Kodokan judo. I did not find this link or this document in this forum, so I added this one.
"Transitions within Kodokan Judo Etiquette",
Author: Naoki Murata, Kodokan Judo Institute, Japan
http://budo2008.nifs-k.ac.jp/pdf/murata_e.pdf
"Transitions within Kodokan Judo Etiquette",
Author: Naoki Murata, Kodokan Judo Institute, Japan
http://budo2008.nifs-k.ac.jp/pdf/murata_e.pdf