Physical and Mental Abilities: Some of us are better suited to some careers than we are to others due to our physical and mental abilities, and limitations. For example, you may want to become a doctor but don't have the intellectual ability to get into medical school. You should, if possible, find a related occupation that makes the best use your strengths while accommodating your limitations.
Chance Factors: Chance factors are life events over which we have little or no control. They can influence what careers we choose and how we progress in them. An example would be an individual not being able to advance in his career because he is a caregiver for a relative.