What are the aspects to take into account when deciding on whether to deploy a technology solution on premises or rely on cloud services such as PaaS?

1- Cost and availability of resources.

2- Security and privacy of sensitive data.

3- Winning analysis criteria of TCO, CAPEX and OPEX

4- Go live support. 

5- Vendor dependent platforms 

1- The cost and the availability of the resources.

2- The security and the privacy of the sensitive data.

3-Vendor Availability.

4- Go live support. 

Many aspects must be taken into account: 

1- The cost and the availability of the resources.

2- The security and the privacy of the sensitive data.

3- Vendor lock-in