According to the SAP S/4HANA Cloud, public edition Asset Management Learning Journey1, after the screening phase of a Proactive Maintenance (4HI) process, the correct sequence of the next three process steps is Planning -> Approval -> Preparation. In the planning phase, you define the scope, schedule, and resources for the maintenance work. In the approval phase, you obtain authorization from relevant stakeholders for executing the maintenance work. In the preparation phase, you procure materials, tools, and services for the maintenance work.