Dozens have been written to help those new to reading instruction become familiar with what children need to know and learn in order to become successful readers. These manuals are helpful for both tutors and those responsible for the coordination and training of the tutors. One manual is not necessarily better than another. Let the buyer beware. Practice critical judgment when shopping for manuals.
Most manuals provide a brief bio.
Make sure you see your concerns listed. Check to see if the appendix includes samples of materials or if the glossary defines terms. If you're interested in research, scan the list of references to see which experts in the field have been consulted. Look at the language. The audience for tutoring manuals varies.