This study aims to find out and Identify the extent of the influence of educational supervision on teacher performance at PAB 1 Medan Estate Private Junior High School. Efforts to improve quality Education needs to be done gradually with reference to the strategic plan. Involvement of all components of education (teachers, principals, communities, committees schools, boards of education, and institutions) through good planning and realize the launched educational program. The supervision of education carried out by the Principal has a positive effect and significant to changes in teacher performance. Teacher performance will be improved if Supervision of the principal's education in the form of leadership and supervision Improved.

The research in this journal article aims to determine the application of letter management standards in increasing the effectiveness of letter management. Therefore, it is necessary to manage letters well and correctly so that the letters can be well organized and the process of returning letters can be carried out effectively and efficiently. It is hoped that effective mail management can be carried out by the relevant staff in managing mail, both for incoming and outgoing mail. So, in researching this journal article, it can be seen that the application of letter management standards in increasing management effectiveness, that the management of incoming mail is divided into six stages which are important to know, namely: receiving letters, sorting letters, directing letters, recording letters, distributing letters and storing letters. Meanwhile, for managing outgoing letters, there are also six stages which include: creating a letter concept, typing, editing, affixing a letter address, folding and enclosing the letter and distributing the letter. The implementation of management has gone quite well, and currently the system is being transferred to an electronic system.