"Then we will have to assign a weight to each type of error - misspellings are a single isntance issue, but tight margins affect an entire page and reduce the page count, which in turn limits the allowable area for images." These things had to come with a science. "To incorporate your suggestion, we should create a table listing the types of errors, sorting them by their frequency in a single pamphlet and then over the entire sample. From there, we can look at the chronological comparison for each type of error."