Strife and disagreement are all around us. You could look at the news for a quick reminder: war, religious battle, economic conflict, even class struggle (for those who read too much Marx in their formative years). But you don't need a view that encompasses the whole world. Think about your personal life, with everything from spats to full-fledged feuds with friends, family members, and work colleagues. When people interact, conflict is inevitable. It may not happen today or tomorrow, but eventually team members will butt heads.