01 For many more, see http://www.thiagi.com.
02 You might decide on other criteria, like customer impact or feasibility – but consider that it is very hard to judge these things from a quick sketch. A very general “importance” (or “rock-and-roll”) scale is probably more useful.
This tool will take a large number of items (one per person) and quickly rank them according to whatever criteria you decide. Use it after an ideation or pitching session to select the ideas or pitches which the group find most interesting, or use it at the start of a session to agree on priorities for the session, rules of cooperation, and so on.
Everyone stands in a group holding a piece of paper. They move through the group, exchanging papers randomly and repeatedly. Then, in pairs, they compare the two papers they’re holding and assign points to each. The exercise repeats several times and the results for each paper are summed.
As well as producing a ranking of the items, this exercise also thoroughly mixes them, starts to establish co-ownership, and leaves the idea papers looking tired and used – which can be helpful if the group have trouble letting go of their ideas.