What $is$ a key difference between top$-$down and bottom$-up$ planning approaches?

Top$-$down planning starts with $an$ end goal $in$ mind, while bottom$-up$ planning begins from scratch.

Top$-$down planning tends $tobe$ less accurate than bottom$-up$ planning.

Top$-$down planning $is$ used for financial forecasting, while bottom$-up$ planning $is$ also used for operation planning.

Top$-$down planning includes little input from finance, while bottom$-up$ plans are created jointly between finance and cross$-$functional teams.