Big Five Personality Trait Assessment

Theories of personality are based on observations of how humans develop behavior patterns. Psychological testing assumes there are certain fixed aspects of human personality and those aspects can be identified through standardized measurements. As part of your application for a position, you may be administered one of these tests to determine if you are a good fit for the company. 
The Big Five personality trait assessment is in your Webliography. Take this assessment and comment on (1) its accuracy for you; and (2) which of those traits may change over time?