Fluency in reading refers to reading with speed, accuracy, and proper expression. Fluent readers can recognize words automatically, read aloud effortlessly while comprehending, and decode without focusing on individual words. Factors like unfamiliarity with text, limited vocabulary, and decoding problems can cause difficulties with fluency. Fluency should be assessed both formally using timed grade-level passages and informally by monitoring accuracy and speed, with consistent progress monitoring. Repeated readings of the same passage done daily is an effective technique for building fluency through increased speed and reduced errors with each repetition.