When the interviewer asked me why my score in software engineering section was not so good, I answered that software engineering is a more practical thing; it's not just a theory. It’s my opinion about theory, though I haven't touched much area of software engineering. Yes, I think there are two kinds of theories: the first type is theories that purely being deduced from other principles and from its born we don’t know the field it should be used to. Wavelet, for example, is such a theory. It has wide application in many disciplines: signal processing, compression, etc, but not at the time when it was developed. Software engineering, however, is another type of theory. It’s the theory that developed, formed from practice. if not the software crisis, there would be no such a theory. all i want to say is that something can never be learned just from theory, so is SE. Let it be the guiding light, practice, no spoon-feed, we are on the road to its spirit.