 Cues in their environment (e.g.a person with cancer) may also prompt a person to become more aware of a particular risk and the need to adopt a particular health behavior.Motivation to change a behavior depends on a person's attitude (the results of perceived advantages and disadvantages of the behavior), social influence beliefs (norms of others, behavior of others, and support of others) and self-efficacy expectations (the perceived ability to perform a particular health behavior).