** Update **
A customer asked the following question:
Thank you very much for your great resources and granting access to them. I am working on providing my team decision-making tools and I was looking at the Diamond Ranking Method.
I would like to ask for a little clarification on this method. When the delegates are asked to rank the options/alternatives, are they agreeing on what is in each level or are each of them ranking them individually and then collectively placing them on the "board" to see which ones are most and least agreed upon?
Thank you for any assistance you can provide.
Thank you again for this very informative site.
Here is the answer to clarify:
Generally the power behind diamond ranking is in forcing participants to make a choice on two extremes of the diamond and although that the decision making is group based. You therefor have several choices. You could divide the delegates into several groups and get them to rank the options. Then bring them together to compare their choices and discuss and perhaps agree on a final ranking.
Alternatively the whole group can work together to rank the options.
Individually ranking and then getting back together to agree may not be as engaging and productive since the discussions on decision making can be quite valuable.