Book excerpt: Family historians depend upon thousands of people unknown to them. They exchange research with others; copy information from books and databases; and write libraries, societies, and government offices. At times they even hire professionals to do legwork in distant areas and trust strangers to solve important problems. But how can a researcher be assured that he or she is producing or receiving reliable results? This official manual from the Board of Certification for Genealogists provides a standard by which all genealogists can pattern their work.