The document discusses various barriers to effective communication. It identifies several types of barriers, including perceptual and language differences, high information loads, distractions, time pressures, emotions, organizational complexity, and poor memory retention. Specific barriers covered in more detail include lack of enthusiasm, distracting gestures, lack of focus, presentation overload, verbal static, and lack of eye contact. Common internal communication problems in organizations are also examined, such as management assuming that all information is shared when it is not, a dislike of bureaucracy leading to less documentation and feedback, and management not being aware of what information has been communicated to which audiences.