The purpose of this research is, according to the teachers' opinions, to determine the level of Effective Schools in terms of the number of EU Projects (Erasmus +, eTwinning) carried out by the official Vocational and Technical Anatolian High Schools in Central district of Giresun province, in terms of manager, teacher, student, school program and education process, school culture and environment, school environment and parent dimensions. For this purpose, the "Effective School Scale" with 0.93 Cronbach alpha score, developed by Sisman (1996) and the Personal Information Form prepared by the researcher were used to determine the effectiveness levels of the schools. The research is a descriptive study in the general screening model. The data were collected from a total of 203 teachers working in official vocational high schools in Central district of Giresun province in the academic year 2017-2018. It has been determined that the effectiveness of schools is a linear increase with respect to the number of EU projects carried out. It has been determined that there is a strong positive relationship between the number of EU projects carried out on the schools and the effectiveness levels of the schools.