Now its time to identify your top five ideas.
I recommend a two step process. Make sure you have had at least two weeks to reflect on your list of 100 or more ideas. The team should have a copy of all of these. This is important as the creative blitz may produce excitement around ideas that won't last. A great tagline will get even better in the first few weeks after some reflection.
Step A: After one week, have everyone list their top three ideas. Use this to create a ranked list with the highest rank at the top, but with all of the ideas still on the list.
Step B: Take one more week and encourage active reflection on the list. Now you have had at least two weeks from the brainstorm. Take a final vote and ask people to select their top choice.
Use this process to create the top five list.