Here is an example of how all three ingredients—mentioning the challenge at hand, the solution, and the main points supporting the solution—can make for an effective thesis statement.
You can think of your thesis as a map or a guide both for yourself and your audience, so it might be helpful to draw a chart or picture of your ideas and how they're connected to help you get started. No matter what, make sure to phrase the central argument or main point or thesis statement based on the assignment instructions and any other supporting material like a rubric provided by the professor.
In some kinds of writing, such as narratives or descriptions, a thesis statement is less important, but you may still want to provide some kind of statement in your first paragraph that helps to guide your reader through your paper.
It offers your readers a quick and easy to follow summary of what the paper will be discussing and what you as a writer are setting out to tell them. A reader who encountered that thesis in a paper would expect an explanation of the analysis of barn owl flight behavior, and then an explanation of the two kinds of flight patterns.
In what order should I present my reasons? Just make sure that your "final" thesis statement accurately shows what will happen in your paper. What did I discover in my analysis?
Many writing centers and writing websites offer help with writing thesis statements. One of the reasons it is important to distinguish the type of central argument graduate students will make in their writing is because it might be easy to confuse a thesis statement with a graduate thesis, which is a specific type of original research report described in our Graduate Thesis resource.