Welcome to the textbook for Engineering Technical Communications courses at The Ohio State University. Our aim in writing this textbook was to create a resource specifically focused on and applicable to the kinds of communication skills most beneficial to the students who take our courses. Therefore, this textbook focuses on developing both technical and professional communication skills and will help readers practice strategies for critically analyzing audiences and contexts, real-world applications of rhetorical principles, and skills for producing documents (reports, proposals, instructions), presentations, videos, and wide variety of other professional communications.