People who succeed have momentum. The more they succeed, the more they want to succeed, and the more they find a way to succeed. Similarly, when someone is failing, the tendency is to get on a downward spiral that can even become a self-fulfilling prophecy - Tony Robbins
Layer 4: vCloud Director – if you want to take your VMware-based virtualized datacenter and turn it into an IaaS-like service, this is what a user should use. Key features include externally facing self-service functions such as an infrastructure services catalog, billing etc.