WSO2 Private PaaS is a multi-tenant Platform as a Service that provides core services like multi-tenancy, logging, identity management, and analytics. It allows SaaS applications to fulfill requirements from both a consumer and provider perspective such as isolation, availability, scalability, personalization, and costs. Non-Carbon applications on WSO2 Private PaaS can achieve some level of multi-tenancy by maintaining separate instances for each tenant, while Carbon-based applications can leverage APIs for identity, security, caching, and retrieving tenant context. The document recommends using WSO2 Private PaaS to develop the survey application due to its support for multi-tenancy and other capabilities required of a