Re: Kata and Aikido
In Tomiki's aikido (JAA - Japan Aikido Association) we have :
Randori no kata omote waza and ura waza (the techniques for randori)
Koryu no kata from dai ichi to dai roku. Six series of waza basically with a prewar origin.
Every kata has some "didactic" element.
There are also other groups of techniques, but they are not considered as kata.