Language is used as a means for communication and language is an untroduction education. To understand the important information, understand what the teacher and others are communicating, and to be able to communicate better then the child must understand the language. This research is done in order to better understand the development of children's language and the factors that influence it. In this research, researchers used the study literatur method and use a qualitative approach. Books, journals, and reports of past research are the sources of data usedthe results of this study stated that the development of a rapidly increasing language in elementary school level children is development of morphology, syntactic, phoneme, vocabulary, pholonogy, and semantic. With this research is expected to help parents, teacher and prospective teachers to understand the development of the language of elementary school level children.

This research aims to analyze and study the principal's leadership style in improving teacher performance at SD Negeri Kintelan 2 Yogyakarta. This research is qualitative descriptive research. Data collection methods used are observation and interviews. The result of this research is that the principal at SD Negeri Kintelan 2 Yogyakarta has a very good and collective leadership style. The principal at SD Negeri Kintelan 2 has a democratic leadership style, can embrace educators and employees in improving teacher performance, learning quality, and good learning quality quickly, and understands constantly evaluating and correcting deficiencies at SD Negeri Kintelan 2 Yogyakarta with appropriate strategies and methods. fit. To be a good leader, there must be factors that influence the attitude of a leader, including; factors of knowledge or leadership skills, environment, behavior or personality, and social. To become a leader who has good qualities, a school principal must have leadership skills, harmonious ties and cooperation, and a good environment.Keywords: Leadership Style, Principal, Teacher Performance