Defining the scope of an ERP project requires careful consideration, but there are best practices and steps to follow in order to ensure a clear and realistic scope. Start by conducting a thorough business analysis to understand your current state, desired state, and gap analysis. Also, define your project vision, goals, objectives, and success criteria. Engage key stakeholders and users and document their functional and non-functional requirements. Prioritize these requirements based on their importance, urgency, and feasibility. Validate the requirements with stakeholders and users and create a scope statement that summarizes the project scope, deliverables, exclusions, constraints, and assumptions. After obtaining approval from the project sponsor and steering committee, create a work breakdown structure that breaks down the project scope into manageable tasks and subtasks. Estimate the duration, dependencies, and resources of each task and subtask to create a project schedule as well as a budget for each task.