http://digfir-published.macmillanusa.com/video_human_comm_accessible/video_human_comm_accessible_ch77.html
Chapter
77. Definition: Operational (functional) from expert
59d61eea7894d2c767000000
http://digfir-published.macmillanusa.com/video_human_comm_accessible/video_human_comm_accessible_ch77_dlap.xmlDLAP questions59d61eea7894d2c767000000