Bottom up approach programming. And that is ultimately what programming is about, solving problems. The Ask Question Wizard is Live! Both top-down and bottom-up approaches exist in public health. For example, the developers at Microsoft created a program called Word that performs word processing activities for a user. Log In instead. The expression "seeing the wood for the trees" references the two styles of cognition. Each subsystem is then refined in yet greater detail, sometimes in many additional subsystem levels, until the entire specification is reduced to base elements. These terms are also employed in neurosciencecognitive neuroscience and cognitive psychology to discuss the flow of information in processing. The result is a framework that the program can use to deliver the required functionality.