You may find it easier to check each of these items one at a time, or else you might prefer familiarizing yourself with all items and checking them all simultaneously. Make a note of all misspelled words. Missing page numbers. If instead of a page number there appears a nonnumeric character or a blank space, then there is something wrong. Impossible page numbers.
Implausible page ranges.
Page ranges that run across too many pages should be flagged for further inspection. Inaccurate page numbers. Check a sample of the page numbers in the index for accuracy by referring to the documentation. At a minimum, check at least one page number for each chapter or section of the documentation. If errors are found, increase the percentage inspected.