Page "Taekwondo" Paragraph 44

Although the terms " WTF " and " Kukkiwon " are often mistakenly used interchangeably, the Kukkiwon is a completely different organization which trains and certifies instructors and issues official dan and poom certificates worldwide.

The Kukkiwon has its own unique physical building that contains the administrative offices of Kukkiwon ( World Taekwondo Headquarters ) in Seoul, South Korea and is the system of taekwondo.

The WTF is a tournament committee and is not technically a style or a system.