Written language learning is influenced by oral language, phonological processing abilities, and other skills such as literacy, alphabetic principle, and auditory and visual perceptual processes. With that in mind, a group of Speech-language Therapy majors designed instructional materials aimed to simulate those skills, which are considered by literature as an important aspect for the literacy process. Later, those materials became a book called, "Conte com a Fono! Histórias e atividades para crianças em fase de alfabetização" ("Count on the Speech-language Pathologist! Stories and activities for children developing literacy," in Portuguese). In order for the book to be improved and assessed by professionals who can use it, this research proposed three studies: Study 1: Instructional materials for oral and/or written language stimulation in children: integrative review; Study 2: Assessment and adjustment of a book aimed at stimulating written language; and Study 3: Applicability and effects of the book "Conte com a Fono!" on municipal school teachers. Study 1 investigated the existence and characteristics of instructional materials aimed at language stimulation through an integrative review. Study 2 proposed an assessment of the book a) by designers regarding its design visual aspects, b) by Portuguese teachers regarding its language, and c) by speechlanguage pathologists regarding its content. Besides, Study 2 also aimed to adjust the material taking into account the participating professionals' opinions. On the other hand, Study 3 aimed to investigate how reading the book would impact the building of theoretical and practical knowledge on important skills for the development of written language in public elementary school teachers (1 st to 3 rd-grade). The reports of the three studies are as follows. The book "Conte com a Fono!" which is the ultimate result of this research, is available on the University of São Paulo website and is free of charge.