It's typically honed during the drafting stage, as research may have necessitated its adjustment.
At the start of a large writing project, it can also be intimidating to put those first words down, so it's often easier to begin composing in the middle of the paper and work on the introduction and conclusion after the meat of the report has been organized, compiled, and drafted.
Writing a good thesis statement is the subject of much instruction and training, as it's the driver of your research and the subject of your paper.
The entirety of your paper hangs on that sentence, which is generally the last sentence of your introductory paragraph and is refined throughout your research and drafting phases.
You can even present the point you are going to argue against.
You must provide your readers with a little background or basic information about the topic you are covering.
There is no rule for exactly how long an introduction should be.
You must consider the length of your overall paper when writing your introduction.
Don't fret though; we're here to provide you with some tips and guidelines for writing introductions and staying on the top of the pile.
If you really want to draw readers in, you have to start your introduction with something attention grabbing.