I'm going to apply for master in accounting, but I'm confused about how to write an outstanding career-goal essay. I read about the instructions and they all mention that career goal must be specific and realistic. How specific and realistic it should be? For example, can I generally mention that I want to work for Big4 for 4 to 5 years and then, say, change to work for another company, something like that? But no matter how specific I blueprint my career life now, it is still an imagination, and there could be many obstacles along the way. Shall I still mention them, to show that I understand the difficulty and I'm well-prepared?