Build a Better Block, parklets, chair bombs, food trucks, guerrilla gardening, transformational 'hacks,' and temporary projects all share common features. Which of these projects are tactical urbanism, and which might fall under creative DIY placemaking? Which short-term actions lead to long-term change? Which become high-reward by creating more permanent public spaces and complete, safer, more hospitable streets? Mike addresses these topics and more in arguing for a definition of tactical urbanism.