What is the 80-20 rule of communication?

Apparently there's 20%, but the real beauty lies beneath the surface. Successful, inspiring and influential communicators operate at a deeper level, accessing the 80% that truly makes a difference in any human interaction. Another way to look at this is that 20% of people do 80% of the work. Research studies conducted at the Carnegie Institute of Technology revealed that around 20% of a person's financial success is due to technical knowledge, and approximately 80% is due to human engineering skills, such as personality and ability to lead people.