The Fry list* of 600 words—broken down into levels—contains the most used words in reading and writing. The words on the lists make up almost half of the words met in any reading task.
Being able to decode individual words is essential to fluency in reading, but the teacher must follow up with phrase and sentence reading. When words are used in a meaningful context, fluency is improved as well as comprehension.
For the purpose of increasing fluency beyond individual word recognition, these high-frequency words have been put into short phrases. The students can improve both speed and accuracy as they practice reading these phrases.