A substantial part of the SIL membership broke off from that organization in 1991 .
A substantial part of the SIL membership formed the Interactive Literature Foundation ( ILF ) , which in 2000 changed its name to the Live Action Role - Players Association LARPA .
A substantial part of the SIL membership broke off from that organization in 1991 and formed the Interactive Literature Foundation ( ILF ) , which in 2000 changed its name to the Live Action Role - Players Association LARPA .