This report provides a comprehensive analysis of communication skills in a business context. It is divided into three tasks, starting with an examination of communication theory, including models, systems (formal and informal), and technologies used in organizations. It identifies barriers to effective communication and explores oral communication skills, emphasizing the importance of listening, non-verbal cues, and providing feedback. The report also covers written communication, detailing methods and styles, such as assertive and aggressive communication, and discusses the use of various technologies to support complex communication. Examples of formal reports, letters, and CVs are included to illustrate practical applications. The report concludes by summarizing the key principles of effective communication and their significance in a business environment, highlighting the importance of clarity, accuracy, and feedback.