The objective of the research was to validate an early detection test for reading difficulties (Cuetos and Suárez-Coalla) in a sample of four-year-old Chilean children. The test includes six tasks that assess the components of phonological processing: a) Phoneme discrimination with five pairs of words for children to recognize if it sounds the same or different; b) Identification of phonemes, a sound is presented and the child repeats it and then recognizes if that sound is in other words; c) Segmentation of syllables, each syllable of a word is identified; d) Repetition of pseudowords, the child repeats words that do not exist because they have been invented; e) Repeating digits of different sizes without making mistakes, the series ranges from one to five digits; f) Verbal fluency, the name of an animal is presented and the child must repeat all the animals that occur to him, in a lim...