IAAS-02: Self-service acquire and use a virtual computer system

Executive Summary: 
A researcher needs exclusive access to a hosted virtual computer system that satisfies a specific set of requirements.
User Importance Summary: 
Researchers are increasingly using externally hosted ("cloud") virtual machines to extend their computing environments without requiring capital investment.
Target Communities and Sizes: 
Researchers - O(1000) Science gateways - O(10)