As IT environments become more complex, enterprises rely on them more than ever before, said Michael Juergens, principle at Deliotte & Touche, speaking at the ISACA CACS audit and compliance conference. Top challenges include cloud computing, virtualization, and a company’s own employees. There may be a greater or lesser risk depending on your industry, technology, business processes, and other factors,” he added. He said that auditors should make a careful risk assessment at any enterprise that uses external cloud computing solutions. Juergens added that virtualization, often a key component of private clouds, carries the same risks as public clouds.