I would have the students prepare for their presentations immediately after their investigation on their topics before moving on to the next topic such as Personal History. Otherwise, the students, especially at the elementary level, will very likely lose the focus for their presentation while studying the Personal History section and completing various projects related to their personal history in their workbook. The completed sheets will be given to the subject teams. This will require every student to pay attention to the presentations, and also allow every team to get positive feedback and know how well they presented their material to their classmates. Another idea is to have the students create a question-answer sheet for other teams to fill in while listening to their presentations.
Students always enjoy coming up with questions to be answered by others.
This may also help each team to focus on what they need to cover regarding their given topic during their presentation. Have the students go back to the computer and work on their Workbook. Have the students create a project that reflects their personal histories. Display their projects in the classroom. Another reason to provide the workbook part by part, besides not to overwhelm the students, is to easily monitor the students' progress.