In the case of history, our knowledge of history exists through interpretation. When using primary sources, you confront two essential facts of studying history:
1. The record of historical events reflects the personal, social, political, or economic points of view of the authors/participants. Any account of an event, no matter how impartially presented it appears to be, is essentially subjective. When analyzing a primary source, ask yourself these questions:
2. It works both ways. You bring to the sources your own biases, created by your own personal situations and the social environments in which you live.
There are some excellent web sites (with much duplication) that will help you through this evaluative process: