"Sunday and Monday were our best indexing days this year," according to a statement issued by FamilySearch.org. "We indexed a combined total of two million records [and] arbitrated almost one million." Over 14,000 volunteers contributed to the record. Over 450 were first timers. About 180 people indexed over 1,000 records.
"Thank you," said the statement. "It's amazing what we can accomplish together in behalf of researchers around the world."
You probably know that FamilySearch uses double key indexing. Each record is indexed twice, called an A Key and a B Key. The two keyings are compared and corrected when necessary. For its 1910, 1920, and 1930 census probjects, FamilySearch is using indexes from Ancestry.com as the A Key. FamilySearch volunteers key the information a second time, the B Key. Anytime the two differ, the record is sent to an arbitrator to look more carefully and resolve the difference.
For the 1930 census, Ancestry.com did not index several key fields, including gender, race, and marital status. FamilySearch is adding these fields. Consequently, indexers will sometimes get 1930 census batches that ask only for the additional information. These batches supplement the existing A Key. Batches for the B Key will ask for all the fields.