The OSDA was founded by Kenneth Sikes in 2007, with nine member leagues.
[1] It has the stated ambition of bringing together innovations in flat-track derby with the traditions of the banked-track sport.
[2] It uses a rulebook developed by the Penn Jersey She Devils, which can be used for men's, women's, mixed or alternating groups of skaters, and for play on flat- or banked-tracks.
[4] The New York Times described it as being known for "allowing tougher, more punishing hits" than the WFTDA.
In September 2011, the OSDA listed six member leagues:[6]