Lincoln-Douglas ebate (commonly abbreviated as LD Debate, or simply LD) is sometimes also called values debate because it traditionally places a heavy emphasis on logic, ethical values, and philosophy. It is a type of American high school one-on-one debate practiced in National Forensic League competitions, and widely used in related debate leagues such as the National Catholic Forensic League, National Educational Debate Association, the National Christian Forensics and Communication Association, and their affiliated regional organizations. Almost all but a few regular tournaments use the current NFL resolution. The Lincoln-Douglas Debate format is named for the 1858 Lincoln-Douglas Debates between Abraham Lincoln and Stephen A. Douglas because their debates were centered around slavery and the morals, values, and logic behind it.