A decision tree can help identify what would happen under a variety of standardized alternative future scenarios. You can identify potential flaws and areas where more research may be needed. Adding the probability of outcomes helps give participants an overall view of what may happen under each alternative. As decision trees list all the alternatives being considered and their outcomes, they are also useful to keep the process on track.
Participants can clearly see what the decision revolves around.
Think of three or four possible scenarios for each alternative. Use the same measurements and analyses for each alternative. Draw a square for each alternative. Draw a circle for each scenario.