Suppose you are planning a party, and your objective is to have an enjoyable party for all guests. An outdoor barbecue would be the best, but only if the sun shines; rain would ruin the barbecue. On the other hand, you could plan an indoor party. This would be a good party not as nice as an outdoor party in the sun shine, but better than a barbecue in the rain. Of course, it is possible to forego the party altogether.
Construct a decision tree for this scenario.