It is best for an accident report to be completed at the time of the accident. A report should contain what happened, witnesses to both the accident and the conditions causing the fall, as well as any other relevant considerations such as lighting/weather conditions. If for some reason an accident report is not completed, you should make a record of what happened yourself. Be sure to include information like a description of the accident, who was present, and the comments of those who witnessed the accident or assisted you after the accident. Also, take pictures of the area if you have a camera available.