Write the next sentence in the following story.

How to write a swalesian introduction
Introduce the topic.
When writing a swalesian introduction, begin by setting up the field you're writing about in a succinct summary. This first sentence (or sentences) holds a lot of weight as it sets up the focus for the article to follow.
Your lead-in should be brief and clear enough for the reader to understand what the article will pertain to. Define your field of study by providing necessary background on your topic.