Weaknesses-

• it takes a large block of time
• it's not appropriate unless the group can afford the time to look at their own process.

Specifications for Success-

• be confident that the process is valuable, regardless of the success or failure of individual inventions. (We often learn more from the "failures" than the successes; both are valued).
• after the demonstrations and presentations, give the teams a few words of validation, then send them home to sleep on it Don't engage the group in assessing the experience until the next day.
• increase the debriefing time of the results of the inventions went extremely well (breakthrough) or extremely poor.
  
• adjust the assignments also; for example, it went well, ask for the two or three most important insights; if so-so or poorly, ask for the most important rule or lesson learned.