Beliefs are formed from previous experiences and information received. For example, some individuals believe that wearing seatbelts is a good idea because they have experienced the benefits. Some believe that seatbelts are dangerous because they have heard of people trapped in their cars. Beliefs heavily influence behavior. Values are what an individual considers most important in life.
Beliefs combined with values drive the actions of each individual.
For example, an engineer might avoid a code review because he believes that he might look inadequate and values the current deadline more. To influence the behavior of an individual, first understand the values and beliefs that are causing the behavior. Second, help correct any beliefs that are based upon false information. Third, help verify that the individual understands the priorities of his values and the consequences of the resulting behaviors. For example, if meeting a deadline is the highest priority value, that individual may not be aware of the resulting quality.