The direction in which you think, apart from changing your immediate perspective, can be a powerful tool in developing new ideas, thoughts and processes.
Bottom up thinking means you look from the ground up. Begin by starting at the very lowest level, in fact, the smallest components. Bottom up thinking is looking at the trees in your forest.
Top down thinking means you look at the big picture focusing on the end results. Look to your mission statement and use it as your road map or mantra when using this style of thinking. Top down thinking is looking over the whole forest instead of looking at the individual or groupings of trees.
Either direction of thinking – top down or bottom up – may lead you on towards useful destinations.
This is a best of post from 2009