Top-down and bottom-up planning is bidirectional planning. It is a combination of top-down and bottom-up approaches. Planning takes place from top to bottom as well as from bottom to top. Differences between the two directions are continuously coordinated and coordinated. In detail, these are methods for planning as well as for the definition of goals and possibilities for their achievement.
In top-down planning, the first global (framework) objectives are defined and ways of achieving them are determined. They are gradually moved to the lower levels of the organizational hierarchy to be developed and specified. This is a divergent approach.
With the bottom-up planning method, relatively narrow goals are initially set at the lower levels of the organizational hierarchy. They are then gradually integrated into the framework of the global goals and strategy at higher levels. It is therefore a convergent approach.