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An abstract is a stand-alone statement that briefly conveys the essential information of a paper, article, document or book. Like an executive summary, an abstract presents the objective, methods, results, and conclusions of a research project. It is a brief summary that appears as the first section of a paper.
The abstract should be a clear, concise summary of the essential information in all the sections of your research paper. As such, it should be written last and appear as an overall summary of essential information only. The abstract's length will depend on the depth of the original source. However, it is usually between 150 and 250 words. The abstract is a very brief summary—it does not take the place of the introduction.
Often, abstracts are published without the complete paper either in abstract journals or in online databases. A researcher often makes a decision on whether to read the paper on the basis of the abstract so it must be a compact and concise summary of the complete paper.
An abstract should:
Take the draft of your completed research paper and:
An executive summary is usually required for Business, Science and Engineering reports or proposals. It is presented on a separate page. The executive summary is written in the present tense and is approximately 10 per cent of the assignment's total word length or no more than 200 words whichever is less. It must cover in brief statements the aim of the report, methods used, major findings and conclusions/recommendations.
Note: The executive summary is not the same as an introduction.
Source: CLC staff