A reader should summarize the development of a theme by stating the theme, by using objective language and by using examples to explain the theme. The theme of the story refers to its topic or its central idea. The main way to build a theme is through characterization, motifs, and symbols. With these three things, the theme can be easily understood and constantly present in your story.
When you are trying to summarize the development you have to state the theme, so your reader know what is it about, then use objective language that will help you better express the subject, and use examples from the text that will clarify the theme you are summarizing.
