In product development and process optimization, a requirement is a singular documented physical and functional need that a particular design, product or process must be able to perform. It is most commonly used in a formal sense in systems engineering, software engineering, or enterprise engineering.
Development [edit]. Sephiroth originally appears as an optional boss in the international version of Kingdom Hearts, and was retained for the Kingdom Hearts Final Mix version of the game, which also added a short scene between him and Cloud.n Kingdom Hearts II, he is also one of the hardest bosses, having no true rival, standing out as the game's hardest boss. Kingdom Hearts II Final Mix also has the Organization XIII rematches and data battles, along with the Lingering Will, all of which are fights that greatly dilute Sephiroth's notorious difficulty.
In KH: Final Mix, a brief meeting between Cloud and Sephiroth can be seen, followed by a 30 second or so battle which ends with a flash of light, so the winner is unknown. In the second Kingdom Hearts game, while still an optional boss, Sephiroth is given a backstory.Sephiroth claims he is the darkness in Cloud's heart and as long as that darkness remains, Sephiroth cannot die. Thus, Cloud and Sephiroth have been fighting for a long time, across many different worlds.n KH: Final Mix, a brief meeting between Cloud and Sephiroth can be seen, followed by a 30 second or so battle which ends with a flash of light, so the winner is unknown. In the second Kingdom Hearts game, while still an optional boss, Sephiroth is given a backstory.