Collaborative CitiesDynamic problems require dynamic collaboration and technology. Our communities today face difficult issuessuch as climate change, access to health care, and homelessnesswhich are tangled, complicated, and constantly evolving. Coined 'wicked problems' more than 40 years ago by the University of California's professors Horst Rittel and C. West Churchman, these issues exceed the capacity of any one sector. Instead, they demand the kind of creative