Scheduling Right

I know this subject has come up numerous times before so for that I apologize in advance. But does anyone have any DEFINITIVE, CONCRETE, and RELIABLE information on how Schedule Right works? More specifically, how it assigns shifts to associates. I know that past answers have been speculative so if you don't really KNOW I would ask that you please not reply and/or post something to the effect of "This has been asked numerous times before". However, if anyone has any SOLID information I would ask that you please share it with the community (or PM me personally). Please, though, none of the standard Walmartesque answers that one might hear from a manager or corporate and no answers that you really aren't sure of. (There seems to be enough of both floating around already.) Thanks in advance for any assistance or insight anyone may have.