Recently, the city of San Jose used a serious game, Buy A Feature, to address some tough budgetary challenges. Since serious games have relevance across a wide range of contexts, including application development and delivery, it's worth relating one anecdote from San Jose's exercise that demonstrates the importance of having a shared vision.
I was a "facilitator" for this exercise, which involved more than 100 members of the community, plus a couple dozen city officials, including Mayor Chuck Reed. According to the ground rules of this exercise, organized by Innovation Games, each group of several community members had to decide which municipal projects (libraries, parks, school programs, fire, police, etc.) to fund and which not to. These "wish list" items formed List A. A complementary List B included other projects that the participants could decide to cut and then shift the money into projects from List A.
Every participant had a small amount of money, but not enough to buy anything from List A outright. Funding anyone's favored project, therefore, required investment from more than one person. Money from any List B project was available only if everyone at the table agreed to cut it.