The other elements help create conflict, tension, suspense and curiosity -- all critical to a successful story -- as well as create a three-dimensional character.
The #1 problem I find, well... perhaps that's too sweeping but I'm trying to make a point here, is that writers often neglect to create a specific goal that in turn provides specific action steps the character takes to achieve her goal.
The Goal "to be happy" leads to a vague and meandering story.
Instead, be specific. What does she need = goal(s) -- to make her happy? The Goal needs to be tangible and quantifiable = in other words, the reader or movie-goer must be able to determine when the character moves closer to her goal versus further away.