Anyone who has viewed the hyung from both Kuk Sool Won and Hwa Rang Do can see the 'striking' similarities. Not sure why most hapkido groups eschew forms... Perhaps someone knowing the answer can enlighten us.
Mainly because hapkido traditionally never had any. Hapkido is taught in partnered drills. In our school, we learn a set of techniques for the following applications:
1. Set of eight same side wrist grabs
2. Set of eight cross hand wrist grabs
3. Set of seven cross hand wrist grabs with the uke grabbing with the off hand as well.
4. Set of six both uke's hands grabbing both wrists
5. Set of six sleeve/collar grabs from the front
6. Set of ten clothing/hair grabs from the front
7. Set of seven clothing/hair grabs from behind
8. Set of seven hugs/chokes both from the front and from behind
9. Set of six defenses against punching attacks
10. Set of seven defenses from a seated position
Within these seventy two 'kata' if you will, are the prinicples within the system. So far as I know, aikido does not use forms either, and likely for the same reason; all of the techniques are taught via partnered kata rather than via solo forms.
We utilize separate punching, kicking, knee, elbow, and knife hand drills for strikes, as well as various footwork drills. After first dan, we introduce defenses against multiple people, empty hand knife defenses, defense against the knife with a rope or belt, empty hand defenses against a gun, defense with a cane, unarmed defense against a sword, and weapon work.
The only 'forms' that we have are weapon forms: bo, nunchucku, sword, spear, and kwando. These are, to my knowledge, culled from other systems.
I suppose that hapkido could be taught using forms, and certainly, there are groups that do use them. But traditionally, hapkido does not utilize forms. If a school uses forms, they have either been culled from another source or they have been created for either that school or that organization.
Daniel