Say what you want to achieve and why your reader should be interested in finding out whether you achieve it.The basic structure can be as simple as “We aim to do X, which is important because it will lead to Y.” Once you’ve narrowed your focus to the specific topic of your study, you should thoroughly cover the most recent and most relevant literature pertaining to your study.The reader, by the end of the introduction, should know exactly what you are trying to achieve with the paper.
Your review of the literature should be complete, but not overly long—remember, you’re not writing a review article.
If you find that your introduction is too long or overflowing with citations, one possible solution is to cite review articles, rather than all the individual articles that have already been summarized in the review.
For example, an ideal experiment should have perfectly randomized samples, but there are many good reasons why this is not always possible.
As long as you warn the reader about this, so that they are aware of the shortcomings, then they can easily judge the validity of the research.
You should assume that your paper is aimed at someone with a good working knowledge of your particular field.
For example, a paper about evolutionary adaptations need not go into too much detail about Darwin - it is fairly common knowledge., you are attempting to inform the reader about the rationale behind the work, justifying why your work is an essential component of research in the field.The introduction does not have a strict word limit, unlike the abstract, but it should be as concise as possible.It works upon the principle of introducing the topic of the paper and setting it into a broad context, gradually narrowing down to a research problem, thesis and hypothesis.A good introduction explains how you mean to solve the research problem, and creates ‘leads’ to make the reader want to delve further into your work.A behavioral science paper only needs to mention Pavlov and Skinner in passing, as their theories are standard for any first year undergraduate.Like in any good Hollywood movie, the first task of the introduction is to set the scene, giving your paper a context and seeing how it fits in with previous research in the field.The introduction is your opportunity to show readers and reviewers why your research topic is worth reading about and why your paper warrants their attention. It presents the background to your study, introduces your topic and aims, and gives an overview of the paper.A good introduction will provide a solid foundation and encourage readers to continue on to the main parts of your paper—the methods, results, and discussion.You are trying to predict what impact your research will have if everything works as it should, and you ultimately reject the null hypothesis.The introduction is the place to highlight any weaknesses in the experiment from the start.