Primary records and sources. Secondary and tertiary records and sources. Originals. Copies. Derivatives. Errors creep in anywhere, any time. But an error in the very earliest, primary, original record? Can that possibly be? Learn how to spot such an error and know what to do about it. The very earliest record of an event or condition, the one closest in place and in time, may sometimes have an error in it. And your evaluation of that record, in light of other facts that are irrefutable may lead you to the conclusion that the original record indeed has an error in it. How do you evaluate records in such a way as to spot an error in an original record? How can you be sure you are correct and the original record is wrong? Why should you detail in writing your thought process? What do you do to accurately document your analysis and share your conclusion?