It is widely accepted that collaboration leads to greater productivity and impact (Katz & Martin, 1997). International collaboration in research is most widely encountered in sciences, but there is a growing interest in social sciences towards establishment of research groups for gathering research fellows who are interested in the same research area. The main aim of the ILTERG project has been to establish international research groups which facilitate collaboration in the field of language teacher education. Through this project long term research companionships have been established to generate high quality studies in the field of language teacher education. Besides, productivity of researchers through cross-fertilization of ideas, and the impact and visibility of the products have been ensured through collaborative research. As a result of the collaboration, more research articles have been published than planned in the proposal. The ILTERG project adopts a dynamic structure which enables researchers collaborate with a wide range of other researchers from different countries. More specifically, through international research collaboration as highlighted by Katz and Martin (1997:14-15), here is what we have achieved for far:- International researchers have shared their research expertise, knowledge, skills and techniques in language teacher education,- The researchers have transfered their research knowledge and skills to each other which have promoted their continuous professional development (CPD),- International collaboration have fostered the cross-fertilization of ideas which in turn generated new insights or perspectives that researchers, working on their own, would not have grasped,- International research collaboration have provided intellectual companionship which created a common research culture among researchers,- International research collaboration have plugged the researcher into a wider network of contacts in the scientific community and as a result, the potential visibility and productivity of the research have been enhanced. Based on above-mentioned features of research groups in order to ensure the productivity, quality and impact of research in the area of language teacher education, international collaboration is a must. Training competent and qualified language teachers is a problem not only in Turkey but also in EU and other countries (Ziegler, 2013), conducting research in local context does not provide generalizable results and final solutions to this problem. We believe, ILTERG Project contributed to the solution of some existing problems in the light of the outputs it has produced. Moreover, the nature of research groups requires international collaboration. To put in a nutshell, to merge different research cultures of different countries is quite needed for a productive research activity.The research groups that were established in each partner university included researchers with different research interests and expertise. They collaborated with researchers with similar interest areas or studying the teacher education phenomena in a different aspect. The groups had a cosmopolitan structure including at least one but in most cases more participants from other countries than the one in which the group was established. As a result below isa list of the outputs of the ILTERG: 1. Media Sources, 2. Establishment of International Research Groups in Language Teacher Education 3. Development and Administration of a Needs Analysis Survey towards Collaborative Research in Language Teacher Education 4. Writing Research Articles5. Composing a a book of principled research in the Field of Language Teacher Education, edited by coordinators of all four participating universities6. Organizing Workshops for Novice Researchers 7. Composing a Guidebook on Establishment of International Research Groups 8. Organizing an International Conference on Language Teacher Education as a multipier event 9. (Extra output) One more book ( A guidebook for prospective teachers about practicum based on critical incidents) have been prepared although it was not proposed in the project proposal at the application.Fnally, Outputs 3, 4, 5 and 7 have been granted with a budget. The timesheets for them have been prepared. For the other outputs (1, 2, 6) there has been no budget granted. Yet they have been also carried out by the coordinating university and partners. All in all, the ILTERG project have ensured the productivity, quality and impact of research in the area of language teacher education. Therefore, the major impact expected from this project have been achieved by conducting and producing high quality studies in the field language teacher education through long term research companionships and cross-fertilization of ideas among international researchers in the field of language teacher education.It is also hoped that project partners continue collaboration to produce more research.