This article describes a Sign Language Teaching Model (SLTM) designed to develop on deaf children different Communication Skills (CS) within a Collaborative Learning Environment with Mixed-Reality (CLEMR). A pilot lesson with the Fingerspelling Alphabet was conducted at the Association of Parents of Deaf Children of Salamanca to determine the Percentage of Development of the Sign Language Communication Skill (SLCS) and others by using a kit of Pedagogical Materials as complementary teaching resources.