You might want to underline ideas that they have in one color of marker and ideas that they do not have in common in another color of marker. Have the students discuss why they chose to include information that the author did not include. Have them also discuss why the author chose to include information that they had not included. Also, have the students identify techniques and strategies that the author used to summarize the information concisely. Help them understand that they do not need to remember all of the details in order to get the gist of the material.
Students take turns telling the teacher part of what to write.
In no case will the teacher write a twenty-first word. Students must revise their statement until it describes the essence of the article in twenty blanks or fewer. When the time is up, students share their summaries as the teacher records the major ideas on the board. These ideas are then included in a group summary dictated by the class and written by the teacher. After the child has read something, watched a video, etc.