Research on the use of audio description (AD) in foreign language education has only been developed over the last decade. This paper introduces an experimental study on the potential of active audio description in learners' oral skills, focusing on the quantitative data which evidenced that oral productive skills are enhanced by this AVT mode. The study involved 81 undergraduate students of Spanish enrolled in a British University. During the ten-week intervention, participants were required to complete collaborative AD tasks. A range of instruments were used for data collection, which include pre-and post-questionnaires, rubrics, pre-and post-tests based on recordings of spontaneous conversation and observation notes by the teacher-researcher. There were two observers who revised all data collection tools, and three external evaluators assessed the potential enhancement of oral productive skills in learners' pre-tests and post-tests. Such a wide choice of tools was essential to allow the triangulation of data, and thus, to guarantee a greater reliability and consistency of the results obtained. Intonation, speed, and stress demonstrated the most significant improvement following the intervention, while the reduction of prolonged pauses was minimal, with the lowest rating among all examined features. Keywords Didactic audio description (DAD), foreign language teaching, oral production skills, experiment, quantitative data 10.17462/para.2024.01.06 Parallèles-numéro 36(1), avril 2024 91 Marga Navarrete Converting semiotic signs into a linguistic code: Implications for language learners' oral skills 1. Introduction This article discusses an experiment that aimed at confirming the following hypothesis: students enjoy active audio description (AD) tasks, they find them beneficial not only for their language learning in general, but also for productive oral skills (fluency, pronunciation and intonation), which is enhanced in spontaneous speech thanks to the use of didactic AD practice (DAD). The study took place in the third cycle of a larger study from which relevant qualitative and quantitative data was gathered and analysed. As such, it followed a cyclical structure in accord with action research principles, a methodology based on evaluation and reflection to implement required changes. Thus, lessons learnt from each cycle were applied to improve the quality of the data collected in each subsequent stage. Although its focus evolved with objectives and research questions, it culminated with this main experiment, which successfully responded to both questions formulated during the course of the study. The methodology used for the first and second cycles mainly provided information about learners' perceptions on AD practice. However, it was not until the final cycle (cycle 3) when there was enough relevant and consistent data to respond the second question which queried about the potential enhancement on oral productive skills in spontaneous speech. 1. What are the learners' perceptions when completing DAD tasks? 2. How does DAD practice impact oral production skills (fluency, pronunciation and intonation) in spontaneous speech? The main objectives of this study were to analyse the impact of DAD practice on oral skills in terms of fluency, pronunciation and intonation, and also, the learner perceptions after completing their tasks. A secondary objective was to outline a series of guidelines for DAD which were extracted once data was analysed. The goal was to contribute to the community of language practitioners interested in an effective use of this audiovisual translation (AVT) mode. Due to space restrictions, this article focuses on the second research question. This is because the qualitative data obtained with regards to learners' perceptions clearly confirmed the conclusions reached in previous experiments (Navarrete, 2020). Participants' reflections towards AD practice were positive and encouraging. They valued how oral productive skills, as well as grammar and vocabulary, were enhanced. They also found their course tasks enjoyable and fun, and they appreciated the way the course was taught. However, on the negative side, some learners were not able to see the link between the course and certain areas of assessment. Firstly, this article introduces the theoretical background of DAD, followed by the methodological rationale and the design of this study. This includes the mixed-methods strategies employed for data collection and analysis of results obtained. Secondly, it discusses the context and participants of the experiment as well as the resources and procedures used for structuring the lessons in a coherent way. Finally, it analyses the quantitative results obtained which evidenced the enhancement of oral production skills in language learning.