Sandbox Client This client is a general test client and is initially created as a copy of the SAP reference client, but is refreshed periodically with a copy of the quality assurance-testing client. This client is used for familiarization and testing application and customization functions. Customizing/Development Client Customizing settings are made in the customizing/development client (CUST) to create a prototype system. All application customizing is performed in this client. All system development occurs in this client according to the business requirements of the CUSTOMER. Once all the settings have been created, these are transferred to the QA client for testing. The development changes are then transported using change request transport management system. Quality Assurance and Testing Client The configuration from Customizing Client is transported to this client tested and checked. When the configuration has been thoroughly tested in this client, and signed off by the Qua...