Document analysis is the process of reviewing and examining documents, such as business plans, policies, contracts, manuals, reports, diagrams, or code, to identify relevant information and requirements for a project. Document analysis can help you understand the current state, the desired state, the gaps, the constraints, and the assumptions of the stakeholders and the system. Document analysis can also reveal implicit and hidden requirements that are not explicitly stated or communicated, but are implied or expected by the stakeholders or the system.