The initial ideas are often raw, and can be refined with collective efforts through several successive rounds, as done with "Idea rating Sheets" http://www.idearatingsheets.org/sites/g/files/g1575211/f/201409/idea_rating_sheet_instructions_1page_v2.pdf (repetition of steps 3-5)
Several rounds of refinement improve most supported ideas and move them closer to consensus.
It is a well defined and usable tool to visualize the consensus offline.
This content is created by the open source Your Priorities citizen engagement platform designed by the non profit Citizens Foundation