Make sure that the software bug is not the same in all three cases. Write a report describing the three incidents. Include a discussion of what you thought about these incidents and summarize what you think about writing software for important systems. Margins should be no larger than 1 inch at the top and bottom and 1.25 inches on the sides. You must have at least three references.
References can include books, journals, newspaper articles, web pages and interviews.
Be cautious of magazines and web pages that might not be sufficiently technical. Include complete correct web addresses for web resources. You can try the comp.risks newsgroup. Peter G Neumann is involved in many forums and discussions on this topic. You can look for books that discuss ethical issues of computing.