Background: Deaf users of Slovenian Sign Language vary in competence between L1, delayed L1 and L2. They follow the grammatical patterns of their language but are unaware of them because the language is neither linguistically documented nor systematically used in the classroom. As a result, the available learning and teaching materials are inadequately prepared in many aspects.
 Purpose: The aim of this research was to create a reference grammar of SZJ by (i) using SZJ for metalinguistic descriptions and (ii) training Deaf signers as researchers and teachers. We observed their performance in order to answer the research question of whether it is possible to involve Deaf signers in the process of creating and disseminating a sign language reference grammar.
 Method: Training a group of deaf L1 signers to (i) start systematic research of their language within a selected formal approach, (ii) create didactic video materials for learning/teaching Slovenian Sign Language as L1 and L2, and (iii) use these materials in language courses for L1 and L2 deaf signers.
 Results: Eleven deaf L1 signers were trained as researchers in a 40-hour course. Five deaf and two hearing L1 signers were trained as language teachers in another 40-hour course and then presented the core concepts of Slovenian Sign Language grammar to 302 members of 12 local Slovenian deaf clubs in 24 editions of a 40-hour language course. For the presentations, they used didactic video materials (duration 5:46 hours). These materials were produced by the five L1 signers and later uploaded to two freely accessible online video platforms.
 Conclusion: The approach proved fruitful: signers were actively involved in the creation and dissemination of the first Slovenian Sign Language reference grammar. The available analytics show that the materials are continuously viewed by both deaf and hearing users.