Bottom-up may refer to: In business development, a bottom-up approach means that the adviser takes the needs and wishes of the would-be entrepreneur as the starting point, rather than a market opportunity (which would be a 'top-down' approach). Top-down and bottom-up design, a term in information processing and systems theory Bottom-up parsing Bottom-up (finance) Bottom-up (cost estimating technique) See also Top-down… (More on Bottom-up)