Did you know that 13 words (a, and, for, he, is, in, it, of, that, the, to, was, you) account for more than 25 percent of the words in print? And 100 words account for approximately 50 percent of the words found in textbooks today? (Taken from page 212 of Kylene Beers's 2003 book When Kids Can't Read: What Teachers Can Do: A Guide for Teachers 6-12.
Sight words are generally considered to be words that students need to know by sight because they don't follow regular decoding rules. High-frequency words are words they need to know by sight because they appear so frequently in texts.
Helping readers develop command over high-frequency words and sight words is a very effective strategy for supporting fluency. In this video Gail works with Hannah on sight words in a book that her teacher, Kelly Yahr, has compiled for her, and in an emergent book as well.