You have to consider all the different subsystems, including storage, compute, and network, as well as different IT management aspects (for example, security, availability, and cost). This approach allows you to adequately prepare your team members in advance for the migration and what it means for them and their workloads. 

Why do we need to migrate now? 
Migration may seem like a technical decision, but at its core this is a business decision. Ultimately, it begs a fundamental question: what’s driving your business to migrate to the cloud, and why now? The benefits of cloud are universal – reduced running costs, faster modernization capabilities and increased security. But often, specific initiators first kick off the discussion within an organization, including: 

• Operational efficiencies and reduction of operating expenses 
• Decreased time to market/release 
• Support for scalability requirements that are more cost effective. 
• Renewal of datacenter or hardware leasing 
• Renewal of licensing
• Application development and modernization