This USMES unit challenges students to find a good way for them to tell many people about any topic or problem of the students' choice. The teacher resource book for the Mass Communications unit contains five sections. The first section describes the USMES approach to student-initiated investigations of real problems, including a discussion of the nature of the USMES "challenges" and of classroom strategy for problem-solving activities. The second section gives information about the Mass Communications unit, including an overview of possible student activities with comments on prerequisite skills, a flow chart and composite log indicating the range of possible student work, a paper describing the use of the unit in primary grades, and a list of questions that the teacher might use. Section 3 contains documentation of class activities through teachers' logs for the unit. Section 4 includes references to other written materials relevant to the unit and section 5 consists of charts which identify the skills, concepts, and processes covered by the unit. (DT)