Sigma Theta Tau International Honor Society of Nursing was founded in 1922 by six nursing students at Indiana University. The organization has a mission to serve, support and improve. Membership is by invitation only to baccalaureate and graduate nursing students who demonstrate excellence in scholarship and nurse leaders exhibiting exceptional achievements in nursing. More than 360,000 nurse scholars have been inducted in Sigma Theta Tau. With more than 125,000 active members, it is the second largest nursing organization in the world. Members are active in more than 90 countries and territories, and the 431 chapters are located on 515 college and university campuses in the US and other countries including Australia, Botswana, Brazil, Canada, Hong Kong, Korea, Mexico, The Netherlands, Pakistan, South Africa, Swaziland, Taiwan and Tanzania.