How has Kodokan technique classification changed over the years?

Question

Over the years several new techniques have been added to the Kodokan judo syllabus, and some variants of existing techniques have since gained their own official names.

How has technique classification evolved over the years?

Answer 1

The original 41 throwing techniques (Gokyō no waza) were compiled in 1895:

Group	Waza
Dai Ikkyō	Hiza Guruma, Sasae Tsurikomi Ashi, Uki Goshi, Tai Otoshi, Ō Soto Gari, De Ashi Barai, Yoko Otoshi
Dai Nikkyō	Sumi Gaeshi, Ō Goshi, Ko Soto Gari, Koshi Guruma, Seoi Nage, Tomoe Nage, Tani Otoshi
Dai Sankyō	Okuri Ashi Barai, Harai Goshi, Ushiro Goshi, Ura Nage, Uchi Mata, Obi Otoshi, Hane Goshi
Dai Yonkyō	Uki Otoshi, Uki Waza, Daki Wakare, Kata Guruma, Hikkomi Gaeshi, Soto Makikomi, Tsuri Goshi, Utsuri Goshi, Ō Soto Otoshi, Tawara Gaeshi
Dai Gokyō	Yoko Guruma, Yoko Wakare, Uchi Makikomi, Ko Uchi Gari, Ashi Guruma, Seoi Otoshi, Yoko Gake, Harai Tsurikomi Ashi, Yama Arashi, Ō Soto Guruma

After this many new techniques were added to the recognized list of kodokan waza:

Year	Te-waza⠀⠀⠀⠀⠀⠀⠀	Koshi-waza⠀⠀⠀⠀⠀⠀⠀	Ashi-waza⠀⠀⠀⠀⠀⠀	Sutemi-waza⠀⠀⠀⠀⠀	Kansetsu-waza⠀⠀⠀⠀⠀⠀⠀⠀⠀	Shime-waza⠀⠀⠀⠀⠀	Osaekomi-waza⠀⠀⠀⠀⠀⠀⠀⠀
1911		Tsurikomi-goshi
1920	Sukui-nage	O-guruma	Ko-soto-gake O-uchi-gari	Hane-makikomi Sumi-otoshi	Ashi-garami⚠️ Ude-garami Ude-hishigi-juji-gatame Ude-hishigi-ude-gatame Ude-hishigi-waki-gatame Ude-hishigi-hara-gatame Ude-hishigi-hiza-gatame	Nami-juji-jime Gyaku-juji-jime Kata-juji-jime Hadaka-jime Okuri-eri-jime Kata-ha-jime ⚠️Do-jime	Hon-kesa-gatame Kuzure-kesa-gatame Kata-gatame Kami-shiho-gatame Kuzure-kami-shiho-gatame Yoko-shiho-gatame Tate-shiho-gatame
1982	Morote-gari Kuchiki-taoshi Kibisu-gaeshi Kouchi-gaeshi Uchi-mata-sukashi	⚠️Daki-age	Osoto-gaeshi Ouchi-gaeshi Tsubame-gaeshi Uchi-mata-gaeshi Hane-goshi-gaeshi Harai-goshi-gaeshi	⚠️Kani-basami ⚠️Kawazu-gake Harai-makikomi Osoto-makikomi Uchi-mata-makikomi
1985					Ude-hishigi-te-gatame Ude-hishigi-ashi-gatame Ude-hishigi-sankaku-gatame	Sode-guruma-jime Kata-te-jime Ryo-te-jime Tsukkomi-jime Sankaku-jime
1997	Ippon-seoi-nage	Sode-tsurikomi-goshi					(✒️ Hon-kesa-gatame renamed Kesa-gatame)
2017	Obi-tori-gaeshi	❌Daki-age (Technique removed)		Kouchi-makikomi			Ushiro-kesa-gatame Uki-gatame Ura-gatame

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Sources:

^{• 柔道の技名称について (kodokanjudoinstitute.org)
• 講道館柔道　技名称一覧 (English)
• Creatividad y deporte: Consideraciones teóricas e investigaciones breves
• The Principles of Osaekomi in Kodokan Judo, The Kano Society Bulletin (2019)
• IJF referee Seminar Malaga 2014, Rules presentation}