The National Speech & Debate Association (NSDA) is the largest interscholastic speech and debate organization in the United States, serving more than 160,000 members at over 4,000 schools. NSDA sanctions competition events in policy debate, Lincoln-Douglas debate, public forum debate, congressional debate, world schools debate, and six individual speech events including original oratory, extemporaneous speaking, dramatic interpretation, humorous interpretation, duo interpretation, informative speaking, and program oral interpretation.