Don't know why anyone would say you cannot move to MBB from SI via an MBA - it's an accepted and well trodden route.Any experience in corp finance projects, be it with MBB, industry wherever will be useful to transition into corp dev; my point being that you don't need an MBA to make this move in industry, but it certainly helps if you want to get there via MBB. MBB projects in any corp finance, transactions, or market focused area will help position your CV towards corp dev - M&A is obvious, but market entry, competitor sizing, segmentation, even product development or innovations/propositions development can be very useful and highly applicable to corp dev these days.The real value of an MBA, aside of the tools and theories of course, is that is provides a distinct point in your career to change direction by breaking the natural progression employers look for, and employers recognise this. For a move into corp dev, an MSc in Finance from a good uni would be just as useful in place of an accounting qual.