Start by stating the actual situation (what we have) as a direct continuation of the context.
If you feel you must explain recent achievements in much detail — say, in more than one or two paragraphs — consider moving the details to a section titled State of the art (or something similar) after the Introduction, but do provide a brief idea of the actual situation in the Introduction. Emphasize the contrast between the actual and desired situations with such words as but, however, or unfortunately.
To spark interest among your audience — referees and journal readers alike — provide a compelling motivation for the work presented in your paper: The fact that a phenomenon has never been studied before is not, in and of itself, a reason to study that phenomenon.
Write the context in a way that appeals to a broad range of readers and leads into the need.
Here are three examples of such a combination: An Introduction is usually clearer and more logical when it separates what the authors have done (the task) from what the paper itself attempts or covers (the object of the document).
In other words, the task clarifies your contribution as a scientist, whereas the object of the document prepares readers for the structure of the paper, thus allowing focused or selective reading. " Although papers can be organized into sections in many ways, those reporting experimental work typically include Materials and Methods, Results, and Discussion in their body.
Do not include context for the sake of including context: Rather, provide only what will help readers better understand the need and, especially, its importance.
Consider anchoring the context in time, using phrases such as recently, in the past 10 years, or since the early 1990s.
An explicit preview would be phrased much like the object of the document: "This section first . Do not make readers guess: Make sure the paragraph's first sentence gives them a clear idea of what the entire paragraph is about.
If you feel you cannot or need not do more than list items, consider using a table or perhaps a schematic diagram rather than a paragraph of text.