This paper is based on a research project aimed to establish which planning issues are critical to apply efficiently synchronous e-learning activities. Describing planning issues about synchronous e-learning activities that are crucial by several authors, gives a specific issue to investigate which of the proposed topics are actually critical to plan and implement this type of activities. The research was performed using a case study and a quantitative analysis with assistant teachers at Universidad de San Buenaventura in Bogota, and results were given to Universitat Oberta de Catalonia.