This chapter discusses different types of informal reports used in technical communication, including progress reports, activity reports, trip reports, meeting minutes, feasibility reports, recommendation reports, and peer review reports. It provides examples of each type of report and strategies for writing them effectively, such as choosing an appropriate format, providing a clear title and subject line, presenting information clearly, and making sure to answer any anticipated questions. The overall purpose is to help technical communicators understand various informal report formats and how to structure and write them for workplace audiences.