 Kool Moe Dee states that Biggie introduced a newer flow which "dominated from 1994 to 2002", and also says that Method Man was "one of the emcees from the early to mid-'90s that ushered in the era of flow ... Rakim invented it, Big Daddy Kane, KRS-One, and Kool G Rap expanded it, but Biggie and Method Man made flow the single most important aspect of an emcee's game".He also cites Craig Mack as an artist who contributed to developing flow in the '90s.Music scholar Adam Krims says, "the flow of MCs is one of the profoundest changes that separates out new-sounding from older-sounding music ... it is widely recognized and remarked that rhythmic styles of many commercially successful MCs since roughly the beginning of the 1990s have progressively become faster and more 'complex'".