As the below worksheet for early elementary diagrams illustrates, opinion writing is a formal piece of writing that requires your opinion on a topic. Usually, opinion writing comes in the form of an essay, articles, or informative pieces, but opinion writing skills are featured across a range of writing styles. Create a writing opinion chart using EdrawMax Online. This free chart maker offers several diagram elements and even allows you to export the file in multiple formats, like Graphics, JPEG, PDF, and even HTML. The early elementary chart below shows that there are empty spaces to decide whether a person likes chips or popcorn.