This document is a guide detailing the Data Landscape Assessment (DLA) service, which assists organizations in evaluating the maturity, efficiency, and strategic alignment of their data ecosystems. The DLA service identifies gaps, risks, and opportunities to transform data into a trusted, agile, and business-driven asset. The methodology employed incorporates industry best practices, notably the Gartner Data Management Maturity Model. The assessment includes a comprehensive evaluation of architecture, processes, governance, data quality, security, and reporting capabilities. Additionally, it benchmarks against market standards, providing actionable recommendations for improvement across People, Process, and Technology. The document outlines workshops with key stakeholders, documentation and metadata analysis, roadmap development, and evaluations of architecture, integration, and operations. It emphasizes the importance of aligning data strategy with business goals and ensuring compliance with data protection standards.