When you enter a date, place, or relationship into your genealogical database have a reason or a source for that date, place, or relationship. If you are working on individuals you knew personally, you can indicate personal knowledge as your reason. For other individuals use the record that made the statement, or if there is no record, indicate why you entered in the date, place or relationship that you did. As you move forward in your research you may realize that you may need a better reason that your personal knowledge or the record that was originally used. You may also reason that your reasoning was not entirely valid.
It is impossible to evaluate if you don’t indicate how or where you got a piece of information.