This is a free online personality test measuring the big five personality traits.
The big five personality traits are the best accepted and most commonly used scientific measure of personality and have been extensively researched. That personality is best described as five traits was discovered through the study of the adjectives that people used to describe themselves and the use of a type of statistical analysis called factor analysis that is used to reduce lots of information down to its most important parts. The five personality traits are extraversion, conscientiousness, neuroticism, agreeableness and openness to experience.
There are many different versions of the big five personality test, this one uses the public domain scales from the International Personality Item Pool.
This test consists of fifty first person statements (e.g. "I am a happy person") that you must rate on how much you agree that it is true about you using a five point scale where: 1=disagree, 2=slightly disagree, 3=neutral, 4=slightly agree, and 5=agree. The items should be responded to quickly without over thinking. It should take most people no more than four minutes to complete.
Your participation in this assessment in voluntary and is for strictly educational purposes. It is not clinically administered and so is not suitable for making medical decisions with. Your answers will be recorded and possibly used for research and/or otherwise distributed in an anonymous fashion.