This will help you to formulate the abstract and keep your paper focussed.
Problem motivation: precisely points to the problem addressed by the paper. Overall, this should be a short summary of the whole content of your paper, including results.
A bad abstract may already move you towards the rejection side in the reviewer's decision process. A table of contents in a paragraph At the end of many introductions, I find an oozing cyst like this moribund specimen: This paper is organized as follows.
After reading a hundred or so papers, we unconsciously pick up the common patterns of the field and begin to imitate them. Massively parallel computers MPCscharacterized by their scalable architectures, are a viable platform on which to solve the so-called grand-challenge problems.
This section is not mandatory, but may be useful for others in identifying interesting new research problems.