As I mentioned before, SaaS is not just a software product, but also a service. In addition, due to the fact that the product is constantly enhanced and upgraded, it requires more active management than a traditional COTS product.
I have found that SaaS implementations are most successful when the business function and IT teams work together to select, deploy and operate SaaS products. In many organizations, SAAS products are identified and selected by the business and IT is engaged later in the process. It is important to involve the IT team early for proper technical due-diligence before the product is acquired. While it is best for the business function to assume overall functional responsibility for the solution, it is important for IT remain engaged on an ongoing basis to manage Cybersecurity, Integrations, and complex Reporting and Data Analytics.