Role of Human Resources (HR) in Agility

In this age of increasing volatility, many organizations strive to become more adaptable and deliver their products/services faster. In one word: Agility. What does it mean for Human Resources? How can HR help Agility, and Agility help HR? What are the different types of Agility? And how does Agility affect HR responsibilities such as performance evaluation, job definition or talent development? So many questions that HR professional should answer in order for HR to play its role in the organization moving toward Agility.