As use of the Software as a Service (SaaS) model for application delivery gains momentum, growing numbers of VARs (Value Added Resellers) and ISVs (Independent Software Vendors) are looking to evolve from 'on premise' suppliers to offering customers a robust and secure managed service option. But in a market that ranges from basic hosting providers offering nothing more than rack space to fully managed solutions complete with in-depth business consultancy, choosing the right provider is complex, especially for organisations unfamiliar with the challenges associated with SaaS.