Response to Invited Comments on "On the Criteria To Be Used in Decomposing Systems into Modules"

Response to Invited Comments on "On the Criteria To Be Used in Decomposing Systems into Modules" presents David Parnas's replies to critiques of his seminal 1972 paper on software modularity. The text includes both the original comments from various computer scientists and Parnas's responses defending and clarifying his positions. This work documents the academic discourse surrounding information hiding and modular programming concepts in the early days of software engineering. Parnas addresses specific technical challenges raised by his peers about the implementation and practicality of his proposed modular design approach. Through point-by-point responses, Parnas expands on his original ideas and provides additional context about how modular design principles can be applied in real-world programming scenarios. The exchanges cover topics from basic definitions to complex implementation considerations. The book represents a pivotal moment in the evolution of software engineering theory, capturing the transition from ad-hoc programming practices to structured design methodologies. Its academic discussion format demonstrates how scientific discourse can refine and strengthen new concepts in computer science.

There are not enough internet reviews to create a summary of this book. Instead, here is a summary of reviews of David Parnas's overall work: Readers consistently point to Parnas's technical papers and articles as transformative for their understanding of software design principles. Many cite his 1972 paper on modular decomposition as clarifying complex architectural concepts through practical examples. What readers liked: - Clear explanations of abstract concepts using concrete examples - Focus on practical applications rather than pure theory - Direct writing style that avoids unnecessary jargon - Papers remain relevant decades after publication What readers disliked: - Some academic papers require significant background knowledge - Writing can be dense and requires multiple readings - Limited availability of collected works in book form Reviews from academic citation databases and professional forums show high regard, with his key papers receiving thousands of citations. His work appears frequently on software engineering course syllabi and reading lists, with students noting the papers helped them grasp fundamental design principles. One reader on ACM Digital Library wrote: "Parnas demonstrates these concepts so clearly that you wonder why they weren't obvious before."

Design Patterns: Elements of Reusable Object-Oriented Software by Erich Gamma This book establishes fundamental principles for breaking down complex software systems into manageable, reusable components.

The Mythical Man-Month by Fred Brooks The text presents core concepts about software project management and system modularity through real-world examples from IBM's OS/360 project.

Clean Architecture: A Craftsman's Guide to Software Structure and Design by Robert C. Martin The book explores principles of software architecture with focus on system organization and component boundaries.

Software Architecture in Practice by Len Bass, Paul Clements, Rick Kazman This text provides methods for creating modular software architectures through case studies and proven design principles.

Structured Design: Fundamentals of a Discipline of Computer Program and Systems Design by Edward Yourdon, Larry L. Constantine The book presents techniques for decomposing systems into modules while maintaining low coupling and high cohesion.

🔹 David Parnas introduced the concept of "information hiding" in software engineering, which became a fundamental principle of object-oriented programming and modern software design. 🔹 The original paper this response addresses (published in 1972) is one of the most cited papers in software engineering history and has influenced software architecture for over 50 years. 🔹 Parnas received the prestigious ACM SIGSOFT Outstanding Research Award in 2003 for his pioneering work in software modularity and design principles. 🔹 During his career at McMaster University, Parnas developed revolutionary approaches to documenting software design decisions, now known as the "Parnas Tables" method. 🔹 Beyond academia, Parnas famously resigned from the U.S. Strategic Defense Initiative (Star Wars) project in 1985, arguing that reliable software for the system could not be developed with the technology available at that time.