This guide was developed for Ohio's Work SITE Learning Model, a national demonstration project for the integration of academic and vocational learning. The guide is designed to assist schools in conducting effective teacher worksite externship programs that allow teachers to observe workplace practices in order to glean information about academic applications. Following introductory materials that provide a rationale for the integration of academic and vocational education, definitions, benefits, and preliminary considerations, the guide offers 16 steps for developing and implementing a teacher worksite externship program. The guide also contains anecdotal reflections of project participants, and a list of 25 references. Thirteen appendixes, which make up half the document, provide the following samples from the project: tools for selecting worksite externship program participants; guidelines for developing a worksite externship team; a worksite contact sheet; examples of publicity for the worksite externship program; pre-visit correspondence; tools for worksite visits; tools for evaluating the worksite externship program; tools for recognizing and acknowledging contributions of business partners; an integrated instructional plan; an agenda outline for worksite externship visits; an annotated list of seven resources; samples of forms collected from worksites; and a sample Occupational Competency Analysis Profile. (KC)