In today's pace of change, to stay in the same job for the distance of your working life is highly unlikely. Different life events can make you look at what career you want. Given how important work is, it is an ongoing puzzle why so many people take the first job that comes along without really considering whether it is right for them.
Equally puzzling is how many people have an ideal job in mind which they are frustrated that they can't find.
The basic career choice rules include: