When should a writer organize details from most important to least important?

I have to write a paragraph on why I'm choosing the most-to-least method of organization over the other methods.
I also have to state why I believe this method is the most effective way to present my topic to my audience. Help please?

2 answers

Standard news stories are organized with the most important facts first. This is done so that people who only read the first couple of paragraphs get the gist of the story.

Also -- people tend to remember what they heard or read first -- when they are more alert and interested.
Thank you!