A risk checklist is a tool for identifying risks based on historical information and knowledge from similar projects. It is a list of potential risk sources or categories that can be used to prompt the project team to consider possible risks that may affect the project. A risk checklist should include information that is relevant and useful for identifying risks, such as lessons learned from similar completed projects and previous project risks that may be relevant to this project. These two pieces of information can help the project manager to learn from past experiences and avoid repeating the same mistakes or overlooking the same threats or opportunities. A risk checklist should not include information that is not directly related to risk identification, such as budget variance data from previously completed projects, project scope and cost management plans from previous projects, or stakeholder analysis metrics from projects with similar risk profiles. These pieces of information may be useful for other aspects of project management, such as planning, monitoring, or controlling, but they are not helpful for identifying risks on a project.Reference:PMI. (2017). A Guide to the Project Management Body of Knowledge (PMBOK Guide) -- Sixth Edition. Chapter 11: Project Risk Management, p. 397. 5

Lessons learned and previous project risks are valuable sources of information for creating a risk checklist. They provide insights into potential risks that may impact the current project and help the project manager develop appropriate risk responses. Budget variance data, project scope and cost management plans, and stakeholder analysis metrics, although useful, are not directly related to risk identification. (Reference: Project Management Institute. A Guide to the Project Management Body of Knowledge (PMBOK Guide) -- Sixth Edition, Section 11.2)