Answer to Question 1
Broadly speaking, four channels of communication exist: visual, written, oral, and nonverbal. However, these broad categories can be broken down further. For example, written communication can be disseminated using a variety of media or forms, including memos, letters, emails, instant or text messaging, faxes, press releases, company websites, blogs, blog applications, wikis, and reports. Oral communication can also use various media or forms such as face-to-face or interpersonal, telephone, voice messages, teleconferences and videoconferences, speeches, meetings, and podcasts. Typically, nonverbal communication supplements oral forms, but it should not be underestimated because most communication in face-to-face situations is often nonverbal. Similarly, visual communication supplements both written and oral forms of communication in the form of slide presentations, diagrams, photographs, charts, tables, video, and artwork.
Channel choice might be influenced or informed by steps in the planning process. For instance, the contextual forces may affect how a message is sent. If an organization typically conveys most routine messages using email, for instance, this may be the most obvious choice. The purpose of communication might affect channel choice as well. In a situation in which the purpose is primarily to establish a relationship or convey goodwill, a face-to-face meeting might be the best choice to achieve this goal. Audience analysis might yield information that indicates it prefers a particular medium of communication such as email or phone discussions.
Answer to Question 2
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Factors affecting communication
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The communication process
Environmental Influences on Personality