Goals hierarchy
Companies are started keeping some goals in mind. To achieve those goals we create sub goals and then sub-sub goals.
The person trying to achieve sub-sub goal may not know (or may forget) about originals goals. And often original goals change. The change is more frequent in web domain than in any other industry. When goals at level 0 change, we don’t get time to update goals at level 1 and level 2. This is more common than not. So many times we end up building something which is not needed. To avoid this situation everyone should always be aware of level 0 goal.