This paper starts from a reflection, and a further adjustment for special needs, on Balboni’s model for didactic action. In this way, it stands out the importance of the identification of the causes and consequences of deficits or difficulties of the student. This will help to identify the most appropriate teaching actions to reduce/surround/prevent barriers to language teaching. This will allow the teacher to identify not only the most suitable techniques for language teaching but also the most appropriate it systems to achieve the objective. In the second part of the paper, we propose a practical example, based on dyslexia, for the teaching/learning of prepositions with verbs of motion in Spanish. This is done by creating and using an interactive and multimedia book (iBook). For the creation of this material, we have only used free (or very low price) software and very easy to use (just need to know how to use a simple word processing and a presentations program).