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A reasonable approach to test company’s business critical information systems such as ERP depends on the visibility to product development. If the system is developed in-house there's likely a good visibility to actual development teams’ work and quality assurance can be involved in the very early phases of product development. Involving QA early can be referred to as shift-left. On the other hand, a system used as a cloud-based Software-as-a-Service (SaaS) without any visibility to development is restricted also from the testing point of view. Only production version testing might be possible, often referred to as shift-right.