Well, well, well...it was a boring lecturer because of "father x'mas". Later in the next post i will show you guys who is "father x'mas". Well, actually I was joking..not because of father x'mas but because i was unwell and I don't know why my brain could not concentrate enough that time. But for those of you who wondering about my modules or subjects in software engineering..then..this is one of them. You have to understand system and you should not how system related each other. The most important thing is you must look a system from top of everything so you can see how each of the elements work.