The article addresses the issue of teacher competence as an important factor in teaching and learning process. Outputs research plays the relation: a competence technology. Expressed position that a resolution of the many variations of pedagogical problems encountered in contemporary school is necessary to conceptualize the idea of Competency technology. Because Bulgarian teachers have developed a number of professional and personal competency, but fail to combine their best effective strategy. And this is because in practical life lost strategic goal. Competency technology is one technology that can combine certain individual competencies to solve specific educational and professional case. As a foothold for constructing Competency technology used "effects" of the study "Visible Learning" Professor John Hattie. Discussed are such effects in the study were identified as unworkable, but Bulgarian reforming educational system are a major trend. Outputs groups relevant factors / effects that are possible core competency of operating technologies. Draws attention to the goal - why construct one such technology: how and what to choose a teacher to operationalize the activities in the context of achieving a school purpose.