The National Reading Panel sought to answer questions about how phonics instruction impacts reading skills. It found that systematic phonics teaching children how letters map to sounds is most effective. Phonics should begin in kindergarten and can be taught whole class, in small groups, or individually. Systematic phonics improves spelling, growth for all SES levels, and helps struggling readers. It determined outcomes in decoding, reading novel words, irregular words, spelling, comprehension, and oral reading.