Teachers are critical to the success of school-to-work systems. They play a key role in the effort to prepare students for further education and work. In order to carry out these new tasks, however, teachers need more professional development. Teacher internships are an innovative professional development strategy that can help educators fulfill these new and often unfamiliar roles in school-to-work systems. Teacher internships place educators in the workplace so that they can experience first hand the skills, abilities, and knowledge that their students will need to be successful at work. Employers also benefit from the skills that teachers bring to the workplace. This relationship between teachers and employers enhances the school-to-work curriculum development and implementation. Strategies to develop teacher internship programs include the following; (1) providing a range of options; (2) recruiting teachers; (3) recruiting employers; (4) securing funding; (5) determining teacher compensation; and (6) evaluating teacher internships. Examples of effective practices include The Industry Initiatives for Science and Math Education in San Francisco (California) and a teacher internship program in the Western School District in Jackson, Michigan. (Resources listed include six organizations and five publications.) (KC)