This is multiplied when the report is a group effort. Team members need to get along with each other, as well as with the client. Differences in personalities are just one area where problems may develop. Time schedules and work division needs to be managed wisely. It may be helpful to have one person, possibly the team leader, responsible for dividing the work and checking that time limits are met.
Mechanical failures can also be a problem.
This can include failure of cars, computers or printers. Do not leave everything until the last minute because a professional report takes time. Inform the instructor immediately if there is a problem that the group has failed to resolve. If anything should fail, there should be time to find an alternative. Another problem that should be addressed is writing difficulties.