Of the three risk factors extensibility, accessibility and complexity, complexity and accessibility are the most relevant for risk assessment. As shown in this figure, most computing models can be mapped into a two-dimensional model using these two factors. Gartner will further discuss Cloud and SaaS computing at the Gartner Outsourcing & IT Services Summit 2010, 20-21 September in London. For further information please visit www.europe.gartner.com/outsourcing.