How is central idea developed?
Beside this, how is the central idea developed further?
From another text, quotes, and numbers and stats. When the author quotes an expert or witness to prove his point further. When the author compares two different things into a compound sentence to show two sides of something in the text to help develop the central idea.
Also asked, what is a central idea?
The central idea is the central, unifying element of the story, which ties together all of the other elements of fiction used by the author to tell the story. The central idea can be best described as the dominant impression or the universal, generic truth found in the story.
While the main idea is usually in the first sentence, the next most common placement is in the last sentence of a paragraph. The author gives supporting information first and then makes the point in the last sentence. Here's a paragraph we can use as an example.