Explore the concept of data abstraction in software development through this comprehensive talk by Kevlin Henney at ACCU 2024. Delve into the theory and practice of information hiding, examining its implementation across various programming paradigms and languages. Gain insights into the historical context, practical applications, and impact on software architecture, dependency management, Domain-Driven Design, API evolution, and agile development. Analyze how different programming languages support or hinder abstraction, and consider the implications for current development practices. Learn about the importance of balancing data visibility and encapsulation in codebases, and understand how proper data abstraction can lead to more maintainable and flexible software systems.