Write the background to your group presentation in easy-to-understand language. Avoid jargon, but explain any terms your reader may not understand. Keep your sentences short and stick to the facts of the background information.
Identify the members of the group and write a short biographical clip about each individual. Also indicate the team leader or chairperson, if there was one. This information helps your reader frame the background of the people involved.
Start with the thesis statement of the group presentation. Identify the specific purpose of the talk and provide background information about how the team came up with the topic, if it wasn't assigned.
Discuss why the group felt it was important to study the issue addressed in the presentation. From the biography references, talk about who was responsible for which part of the group presentation and the expertise the individual brought to the discussion.
Give your reader an indication of the starting point and end date of the group presentation and how long it took to prepare. It is relevant that your reader has an indication of the time involved, particularly if it required a significant commitment. This background information will help them realize the presentation wasn't thrown together the night before it was due.
State where the group presentation will take place, if it is relevant. If it is an in-class talk, the location doesn't matter. If, however, the team travels to different sites to deliver the presentation, list the times, dates and places.
Sum up the group's findings and identify further work that needs to be done in the area. The background of the group presentation wouldn't be complete without telling your reader the findings. Stick to the facts when summarizing and remember not to introduce new information about the group presentation at this point.