Martin Szugat gave a guest lecture on developing a data strategy. He explained that a data strategy guides how a business uses data and analytics to make decisions and gain value. It involves understanding user and business needs, exploring available data sources, and developing analytics use cases and a roadmap to increase the maturity of data-driven processes, products, and business models over time. Szugat also discussed common reasons why many data projects and products fail, and emphasized the importance of designing data strategies using proven approaches like CRISP-DM to ensure business impact, user acceptance, and feasibility based on available data.