"Here’s how to preview: Read the entire first two paragraphs of whatever you’ve chosen. Next read only the first sentence of each successive paragraph. Then read the entire last two paragraphs.I skim a lot. Over the years I've developed a memory which seems to be largely based on knowing where a piece of knowledge is rather than necessarily what it consists of. Which does mean I can also be a bit forgetful. The other day I saw a photograph from Christmas morning in 1998 and although I was holding and wearing presents I still have and cherish, I couldn't remember the moments in which I'd been given them. Which is a bit worrying, but probably a "natural" sign of ageing.
Previewing doesn’t give you all the details. But it does keep you from spending time on things you don’t really want — or need — to read.
Notice that previewing gives you a quick, overall view of long, unfamiliar material."
Books Bill Cosby’s Three Proven Strategies for reading faster. It probably works best if you do the voice: