Describe any bias found in each source. If you feel that a particular source does not contain bias, explain why. Describe the context surrounding each source. If you are unable to determine the context, explain how you would find it. Describe each source's level of reliability. If you are unsure about a source's reliability, explain how you would determine it. Explain the extent to which each source is corroborated by the other sources. If a source does not seem to be corroborated by the others, explain how you might find a source that would corroborate it.