The year 2006 was a special year for Taekwondo competition. Up untill then the only way to compete in a world championship in WTF/Kukki style Taekwondo was through sparring. But in 2006 the very first Poomsae World Championships was held in Seoul, and now you could compete not only in sparring in a global scale but also in Poomsae.
Up until that point in history most masters were totally free in how to teach Poomsae around the world, and there was as many variations in Poomsae performance as there were people. One thing that was decided for the world championship was that there needed to be one and only one standard or "true form" to be followed so everyone could be judged on the same basis. This lead to a reprint of Kukkiwond textbook as well as a whole host of other books on Poomsae so this new "standard" could be taught.