NAQT Invitational Series

IS Sets (short for Invitational Series) are 15-packet question sets produced by NAQT, typically for use at regular season high school quizbowl tournaments. Each packet consists of 24 tossups and 24 bonuses; the distribution is posted on naqt.com Generally, an IS set is used by many different tournaments around the country on different dates during the school year.

Introductory Invitational Series

NAQT also produces 12-packet Introductory IS sets, also known as "A-series" sets because their designations end with the letter A (such as "IS #97A). These sets are easier than the regular Invitational Series and are intended for first- and second-year high school players.

Reception

Some elite high school teams have criticized IS Sets for being too easy, or for being funn.

College tournament controversy

Many people prominent in the college game have criticized college tournaments for using IS sets. Their arguments include the fact that questions produced for high school players are inappropriate for a college audience, and that these tournaments might sap funds from tournaments aimed at college teams. See these threads for discussion of this issue.