Software as a Service

Research the "as-a-service" type of approach to cloud computing while considering Software as a Service (SaaS), Identity as a Service (IDaaS), Platform as a Service (PaaS), and Infrastructure as a Service (IaaS). How can these approaches reduce costs and add value ? Include in your analysis a discussion on Identity as a Service (IDaaS). How would IDaaS integrate with the on-premise solutions for human resources, supply chains, and collaboration services in a SaaS solution?