Incomprehensible presentations

As the complexity and variety of information increases the capacity for an individual to understand not only the data being presented but to draw implications about the data is frustrated by incomprehensible presentations by speakers. It seems that conferences, lectures and other forms of presenting material is hindered by disorganization, distractive comments or stories, ineffective use of media such as overhead projectors, inefficient use of time and inaudible or mumbled vocal presentations.