Keys to Collaboration

Left-hand stencils, Perito Moreno, Argentina(3,000–9,000 BC)What are the essential keys to collaboration?This started as an answer to a Quora question, and I’ve started another running list similar to The Work of Playing, which can also apply to design thinking/innovation in groups. The question relates to business-related contexts, but still apply because the same dynamics are at play.A good