- Premise=sets the contest for the argument. Example:
"A new study on Mars has been published by the NASA."<== it does not say anything, but it introduces the argument (who is likely going to talk about the study).
- Stimulus=it's the text(the whole argument) as far as I know
- Main Point=I have never heard of Main Point in CR, but I think that it refers to the conclusion of the author.
Quote:
The pace of technological development brings a constant stream of new devices to the market, and many of them enjoy commercial success.
- Premise
Quote:
But announcing new technology too soon after the introduction of a successful device can backfire. Once consumers hear about the new device, they may stop buying the one currently on sale.
- The name you give to this part of the text does not matter. What is important is to understand that this is a fact: the author is setting up the points that will lead him to the conclusion.
Quote:
So, if a company wishes to announce the upcoming sale of a new device, it should wait until purchases of the old device have begun to decline.
- Conclusion. And finally here it is. This is the conclusion (or main point, according to my definition) of the argument.
The assumptions, by definition, are not written. You 'll be asked to find them in some questions.
Hope this solves your doubts