Teachers who get an "inside look" at business and industry through internships and summer jobs are much better equipped to prepare their students for the rigors of the workplace and postsecondary education. Teacher internships followed by the revision of course content, instructional plans, and assessment strategies can change school and classroom practices in ways that lead to higher student achievement. According to the "High Schools That Work" approach, successful teacher internship programs include the following elements: (1) a site action plan and a staff development plan for involving the whole school in improving student achievement; (2) a needs assessment showing strengths and weaknesses of local school and classroom practices; (3) a curriculum that emphasizes high standards and use of authentic problems to improve school-based learning; (4) teachers' action plans for incorporating internship experiences into course syllabi and instruction; (5) meetings and work sessions before, during, and after the internship to help teachers develop and share materials and strategies; (6) ongoing communication between teachers and host companies to continue the learning process after the formal internship period ends; and (7) evaluation, feedback, and dissemination of information to ensure that the program benefits the greatest number of teachers and students. (This document includes examples of student projects that resulted from their teachers' internships and a list of the High Schools That Work goals and key practices.) (KC)