Fresh from the clogged tubes of teh intarwubs…
"For several years now I've been working casually on just that: a classification of the types of science in sf that would be more detailed than the obvious correct vs. incorrect vs. gray area / fudged.<br />
This first version was prepared for a panel at Arisia on the science in sf films and hence draws all its examples from them, but I think it works just as well for sf literature, as well." Good work, that man.
"… the key is to find scarcities — as we've said many times. But, not just any scarcities. Those scarcities must also be valuable. Value plus scarcity is the real reason to buy. And, the intersection may be different for each kind of content creator. In fact, it should be different for each content creator, because it is essential to recognize how to express the key value that a particular creator brings to the table. To help explain that, we discussed 10 key scarcities that are helpful to think through in creating reasons to buy. The list is not complete, but is a good starting point."