The first can be about your past professional experience. The third can be about the schools particular program. Limiting yourself to one career goal is best, if it is general.
At each step, demonstrate why and how these experiences, goals, or attributes motivate you to get your M. If you have a couple of different jobs in mind, that is all right, too.
My unusual combination of experiences sets me worlds apart from my physics-only ex-fellow students. For the late 20th and early 21st century, this means, in terms of topic, clearly one industry: High Tech (just watch the stock market).
Working for (Big Consulting Company), (so far) exclusively on international assignments in high tech industries, is the kind of job I had envisioned at that time. I am well equipped for this with my physics background. Through language study and travel exposure, I have come a long way in getting myself prepared.
Then events will develop in a high speed, and you will be a witness of your own going up.
No pitty, no moral principles – that’s how the majority of businessmen think. So, the law of business says you have to put commercial goals onto the first position.
It isn’t easy to earn money if you think of problems of other people. If you’re not ready to wreck rivals there’s no place for you.
It’s a matter of making money, but not anything private.
Primary aims are: become a monopolist or a leader, get the market in your disposal, persuade the others you are the best.
If these conditions are kept, then you may have opportunities to turn into a millioner, or even a billioner. Many problems to fix, the staff requiring to increase their wages, competitors, capricious customers. It likes only those who are able to overcome difficulties.