When evaluating information, it is useful to identify if it's a Primary or Secondary source. By doing so, you will be able recognize if the author is reporting on his/her own first hand experiences, or relying on the views of others.
A first person account by someone who experienced or witnessed an event. The original document has not been previously published or interpreted by anyone else.
Examples include:
One step removed from the primary original source. The author is reexamining, interpreting and forming conclusions based on the information conveyed in the primary source.
Examples include: