A proper summary should be concise, meaning it should only include the most important information from the original text. It should also be written in the reader's own words to demonstrate understanding. Lastly, a good summary should capture the main idea or message of the text. However, a summary should not include personal opinions, details that are not relevant to the main idea, or new information that was not present in the original text. It should also not be longer than the original text itself.
