Structure

The different types of information typically found in the introduction are shown in the animation below. General background information is given at the beginning of your introduction and more specific information about the aims of your particular experiment at the end. However, this is not always the case and you should be prepared to vary the stages according to the purpose of your particular experiment. 

Here are some tips about writing your introduction:

Read Read your laboratory notes, textbooks and, in some cases, other sources such as journal articles.
Draft Draft and re-draft your introduction a number of times. Leave the final draft until you have written up the rest of your report and you have a clearer understanding of how your results and your interpretation of your results relate to your aim and your introduction as a whole.
Write Two paragraphs is often enough - you don’t need to write everything that is known about the topic. Your lecturer wants to see that you understand the topic, so try to use your own words combined with the technical language of your field.
Avoid Be careful not to copy your laboratory notes and textbooks. Also avoid quotations.
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