Decoding speed, vocabulary, and cognitive factors like attention and motivation can impact a reader's comprehension. As readers develop, comprehension requires understanding words, sentences, and symbolic meaning. Comprehension depends on quickly recognizing words and determining meaning. A large vocabulary allows faster interpretation, while limited vocabulary slows understanding. Distracted or unmotivated readers may reread without comprehending. Poorly written text can decrease speed and hinder comprehension by challenging decoding, syntax, and motivation.