This technique shuffles ideas one by one to select a certain set. Next to ideas, you can also use this technique for shuffling and selecting objectives.
Executing the Method
Spread out all alternatives on the table or in another good overview.
Review each idea shortly, and make an order from best to worst, comparing them one by one.
Remove Worst Alternatives
Remove the worst half of ideas. Review the remaining half and order them again from best to worst.
Repeat the last step until a few numbers of ideas is left or you feel further iteration is pointless.