Great little video in Fast Company about the need to take time to think and focus on big tasks rather than let yourself be continuously distracted. Simple to say, more difficult to do! The brain takes 15 minutes to declutter itself and prepare for a deep dive, yet many tasks get less than that time before the first interruption!
Distractions are caused by YOU, when you answer the phone, respond to an email or pick up your iPhone or Blackberry when it buzzes. By others when they talk at you, share musings, ask questions that they know the answer to, and generally get in your face. Your best work needs quiet and time to focus. The video recommends blocks of an hour before returning to the melee.