This is the eight edition of what had previously been called the Application Delivery Handbook. When the first edition was published in 2007 one of the primary goals of the handbook was to help IT organizations understand that successful application delivery involves a combination of optimization, management and security. Interestingly enough, many of the service delivery challenges that we identified in 2007 are still of concern to the majority of IT organizations. However, as described in this year’s handbook, driven largely by the broad adoption of BYOD, virtualization and cloud computing, IT organizations are now facing a new wave of challenges – many of which are far more daunting than anything we have seen before.