This report discusses the theories of organizational communication and barriers to effective communication. It explores critical theory, information theory, post positive theory, groupware theory, information flow, and socio-psychological tradition. It also examines barriers such as inability to listen, lack of transparency, dissatisfaction, conflicts, and language and cultural differences. The report provides strategies to overcome these barriers, including being a good listener, follow-up communication, consistency of message, ensuring feedbacks, and being aware of language and content of the message. Recommendations are also provided for Learn English UK to improve communication. Subject: Business Communication