Start by describing the big picture in the introduction, a general statement of your views, much like a thesis. It is the statement that sets the tone for the entire essay.
Your paper should also have a judgment and a conclusion.. Since it is a reflection essay, it should be your own words and how you exactly perceive things. It should state your personal insight and how you see things we learned this semester as it relates to your project.
Please include a section at the end of your paper answering the following question:
What was the biggest challenge of working in your group and how, if you were able to, did you overcome it?