What is independent testimony?

Independant testimony is having witnessed something on your own. However it may be difficult for you to believe what happened if you are the only one to have seen it. What makes it easier to believe, is when many people have their own independant testimonies of the same event. For example, if there was a burning building and someone phoned the police, the police would not necessarily believe it to be true, however if there were many people phoning in with the same theory, the more likely the story to be true, and the more likely the police to take action.