The answers to your questions would most likely be in your text book. Or on your teachers power point slides.

Know their not at..thats why i came on here in the hope somebody might have an answer.

What type of exam doesn't have proper study materials? I would complain to your professor.

By the way, you're asking Human Computer Interaction questions in a Java Programming Language forum. I would recommend trying to find a User Interface forum some where and ask your questions there. You most likely will get a better response.

OP's language skills are poor enough that he's unlikely to understand his textbooks...

So a course in elementary English would be first called for before trying to tackle human-computer interface theory.

Forget about it, it's a pity to come across such ignorance when a person is looking for help.(I presume you were refering to me when you questioned my english skills.)