以下是引用mimibobof在2005-11-30 9:13:00的发言：
Thanks for your post. Just one more question. If you change from one company to another, why it is not "change of employer" but "new employment"? Then in which situation, "change of employer" will be used? I am really confused. I may change too in the future, will have the same question I suppose. Thanks.

I know this is the most confusing question. I asked USCIS hot line the exact same thing. Their answer is: if you're only changing your employer, but not requesting an extension of your current I-797's expiration date, then you choose "change of employer". However, as far as I know, most lawyers request a new three-year H1 from the date of the new effective date, which means your new I-797's expiration date will be different. And in that case, you are both changing employer and extending your current status, and you should choose a. instead.

Hope this helps.