[quote][b]Posted by:[/b] MasterSin [quote][b]Posted by:[/b] talon2000 I would think they would start from the ground up. Especially if they're accommodating for the next-gen consoles. [/quote] Pretty much this. Also since they are using brand new technology made by them, it would be the best start from scratch so, there are a lot of reasons why they actually would have to start from zero.[/quote] Typically in software, you try to avoid re-writing from scratch all over the place; it's extremely risky. Per your example, it might make a lot more sense to augment an existing engine to support both the XBox 360 and XBox 720, rather than start from ground zero and lock it into one platform. However, moving from a single platform to multi-platform, and hopefully even cross-platform, makes a pretty strong case for starting from scratch. An existing, single-platform engine just might not be flexible enough to move to another platform.