In a paper, how would you name a part that describes the big picture before the technical details I have been struggling with finding the right title for a section in a scientific paper (in computer science but I think it can apply to many other fields). I know it's not the first time I encounter this problem, so I guess it's worth asking the question.

For now the outline of the paper resembles something like this:


Introduction: where I describe the problem and the outline of the paper
Background/Related work: where I describe what the state-of-the art is in the field
Big picture: where I describe where we want to go and how we will go there from a high level standpoint (more detailed than the intro, but less detailed than what follows)
[... Implementation ... Technical Details ... Application ... etc]: the body of the article
Conclusion


I'm struggling with the title of the third part Big picture. I want a title that conveys the idea of a high level description of what will follow so that the reader does not get lost in the technical details and keep in mind what the general plan is. Things I had in mind so far: big picture description, methodology, strategy, overview, plan of attack, ... However, none of these section title conveys exactly what I want.



Is there a common practice for the title of such a section of a paper? 

What could be a good fit?
In my research area (software engineering), a widely used name for this section would be Overview.