Sandbox system: This is an optional system that can be used to explore the SAP S/4HANA Cloud Public Edition capabilities and features before the implementation project starts. It is not connected to the starter system or the test system and does not have any data migration or configuration tools. It can be refreshed on demand by the customer1.
Starter system: This is the first system that is provisioned for the customer after the contract is signed.
It is used to perform the fit-to-standard workshops, where the customer validates the standard processes and identifies the gaps and requirements. It also serves as the configuration system, where the customer configures the business processes using the SAP Central Business Configuration tool. The starter system is connected to the test system and can transfer the configuration and master data to it2.
Test system: This is the second system that is provisioned for the customer after the starter system is configured. It is used to perform the integration testing, user acceptance testing, data migration, and cutover activities. It also serves as the production system, where the customer runs the live business processes after the go-live. The test system is connected to the starter system and can receive the configuration and master data from it3.
The systems that are not used to implement SAP S/4HANA Cloud Public Edition for a customer are:
Trial system: This is a system that can be used to experience the SAP S/4HANA Cloud Public Edition solution for a limited time. It is not connected to any other system and does not have any data migration or configuration tools. It is not part of the implementation project and does not require a contract4.
Development system: This is a system that can be used to develop custom applications or extensions using the SAP Business Technology Platform. It is not part of the SAP S/4HANACloud Public Edition landscape and does not have any data migration or configuration tools. It requires a separate contract and license.
References = [SAP S/4HANA Cloud Public Edition - System Landscape], [SAP S/4HANA Cloud Public Edition - Setting up Systems and Authorizations], [SAP S/4HANA Cloud Public Edition - Trial System], [SAP S/4HANA Cloud Public Edition - Development System].

SAP Sustainability Control Tower is a cloud-based solution that enables customers to record, report, and act on their ESG data. It provides a comprehensive and consistent view of the ESG performance across the enterprise and the value chain. It also supports automated, auditable, and compliant reporting based on global standards and frameworks. SAP Sustainability Control Tower helps customers to embed sustainability into their core business processes and make balanced decisions that support their sustainability goals. References = SAP S/4HANA Cloud, Public Edition - All Learning Journeys > Implementing SAP S/4HANA Cloud Public Edition > Unit 3: Sustainability and ESG Reporting > Topic 3.1: Introduction to SAP Sustainability Control Tower. SAP Cloud for Sustainable Enterprises: Taking Action Together. SAP Sustainability Control Tower: Data Foundation for ESG.