Tesis para optar al grado de Magíster en la Enseñanza del Inglés como Lenguaje ExtranjeraThe purpose of this action research was to explore how methodology affects the oral production of second year university students in their third and fourth semester business English for Special Purposes classes. This theme was chosen to be researched because through teacher observation it was evident that the students were far below the English level that was desired for the third semester by the program at the Universidad Alberto Hurtado. To analyze this problem a data-driven qualitative methodology was used to collect data through a cycle of two data collections. After the first data collection cycle, the collected data was analyzed using open coding to identify major and minor themes and then interpreted. Then the intervention of using teaching guided pre-task planning was created base on the interpretation and literature. This intervention was applied in the second data collection cycle. The new collected data was then analyzed and interpreted. There were three implications concluded from the interpreted data. The limitations regarding the time to do the study and sources of data collected were also taken into consideration in how they impacted the research findings. In conclusion, this action research could determine that methodology does affect students’ oral production abilities, but due to the limitations of the study it is unclear to what extent their abilities were affected. It was also discovered that there may be other factors that affect students’ oral skills as well such as self-confidence and opportunities given to use the language in the classroom. From these conclusions, ideas for future research were then proposed that will help continue to study this theme