This document provides an introduction to a research study on using advertisement video to teach speaking skills to 11th grade students. It discusses the importance of language and communication, and defines key terms like effectiveness, medium, audio-visual media, speaking, and advertisement. The study aims to determine the effectiveness of using advertisement video to help students practice speaking as advertisers. It is being conducted with 11th grade students at SMA N 1 Pegandon Kendal school during the 2011-2012 academic year. The document outlines the background of the study, research question, objectives, limitations, and significance. It also provides a literature review of concepts relevant to the research.