John Holland's Career Development Theory states that people are one of six personality types and there are six basic work environments. People will be more successful and happy if they choose to work in an environment that matches their personality. Those with similar personalities who work together will create working environments that match their type.
Holland's six personality types are social, conventional, artistic, investigative, enterprising and realistic. His six work environments match the personality types. When searching for work, an individual should look for a job that matches his abilities and personality.
There are tests available, such as the Career Key Test, that can help people learn more about their personality type and the careers that match.