One page PDFs published by Cisco. Each one focuses on a specific topic and is a fine reference.

• QoS Baseline
  This is the most important At-a-Glance document by far. In a way, it is the foundation of your QoS policy, and all other At-a-Glance documents build off it.
• QoS Best Practices
• Branch QoS Design
• Campus QoS Design
• WAN QoS Design