Black belt ranks may have titles associated with them, such as "master" and "instructor", but taekwondo organizations vary widely in rules and standards when it comes to ranks and titles. What holds true in one organization may not hold true in another, as is the case in many martial art systems. For example, achieving first dan ranking with three years' training might be typical in one organization, but considered too quick in another organization, and likewise for other ranks. Similarly, the title for a given dan rank in one organization might not be the same as the title for that dan rank in another organization.