Purposes or introduction is a good start for a writing project. Purposes serve as a summary of the whole project. It introduces what the project is about, and what the project leads to? Developing a good introduction is important for the writings.

In the blue light project,for example, we have first write an abstract describing what a blue light glasses is, and what does it do? Then we write an introduction to describe what the project is about. Knowing the purpose of the subject could guide the readers through the project and make the project more easy to follow.