When this idea was rejected, the roundtable occurred informally and resulted in the formal incorporation and creation of OUSA.

[1] Part-time students at the University of Toronto withdrew from the Alliance, as did Queen's Alma Mater Society, citing concerns over the organization's management in the mid-1990s.

[3] The Students' General Association (SGA-AGÉ) of Laurentian University was admitted into OUSA in April 2016, with membership taking effect May 2016.

[4] Most recently, the Ontario Tech Student Union (OTSU) joined OUSA as a full member in April 2023.

According to the organization's Bylaws, each association is entitled to appoint one additional non-voting resource member to OUSA's Steering Committee.