LVFUHWH (YHQW 6LPXODWLRQ. 6 PRGHOV WKH V\VWHP¶V G\QDPLF EHKDYLRU DV D GLVFUHWH VHTXHQFH RI HYHQWV LQ WLPH > @ $ ZLGH UDQJH RI VXSSO\ FKDLQ SODQQLQJ SUREOHPV KDYH EHHQ PRGHOHG ZLWK '(6 PRGHOV VXFK DV VXSSO\ FKDLQ GHVLJQ LQYHQWRU\ SODQQLQJ SURGXFWLRQ VFKHGXOLQJ DQG VXSSOLHU VHOHFWLRQ > @ )LYH PRGHOV KDYH EHHQ LGHQWL¿HG ZKLFK XVH '(6 DV WKH PRGHOLQJ WHFKQLTXH RI FKRLFH 3HWURYLF HW DO > @ GHYHORS D '(6