Techniques include:
• Eliminating branches that conflict with the growth of other branches
• Removing limbs that interfere with wires, building facades, gutters, roofs,
  chimneys, windows or obstruct sidewalks
• Removing dead or weak limbs that pose a hazard or may lead to decay
• Removing diseased or insect-infested limbs
• Training young trees
• Removing limbs damaged by adverse weather conditions
• Thinning or removal of branches to increase light penetration
• Improving the shape of the tree