Living in the 21st century demands from all citizens, but particularly from teachers, the development of specific skills to face the challenges of a society in which information and communication are the key to successful fulfillment of most work and life needs. According to the Partnership for 21st century skills (2011), these skills include learning and innovation skills (creativity and innovation, critical thinking and problem solving, and communication and collaboration), Information, Media and Technology skills and Life and Career skills (flexibility and adaptability, Initiative and Self- Direction, Social and Cross Cultural Skills, Productivity and Accountability, Leadership and Responsibility).At the same time, the improvement and modernization of educational practices in the English as foreign language (henceforth EFL) field require reflective teachers with strong research skills that enable them to observe and analyze their educational contexts in order to propose creative and viable alternatives to traditional methodologies. Project-based learning (hereafter PBL) provides an ideal framework to guide teachers in development towards the acquisition of the aforementioned abilities in an engaging and motivating way and gives them a first-hand experience on the usefulness of this methodology for enhancing language and research competencies as well as 21st century skills.