Nevertheless, I consider OOP as an aspect of programming in the large; that is, as an aspect that logically follows programming in the small and requires sound knowledge of procedural programming.

The quote by Niklaus Wirth emphasizes the nature of object-oriented programming (OOP) as a paradigm particularly suited for programming in the large, meaning complex software systems that require careful design and structure. Wirth suggests that OOP is not an isolated technique but a logical progression from programming in the small, which deals with simpler, more focused programs. This distinction highlights that mastering smaller-scale programming concepts is essential before effectively applying OOP to larger projects.

Wirth underscores the importance of a sound knowledge of procedural programming as a foundation for understanding OOP. Procedural programming teaches fundamental concepts such as control flow, data structures, and modular design. According to Wirth, these principles provide the building blocks that make it possible to organize and manage the complexity inherent in larger software systems using objects, classes, and encapsulation.

The origin of this perspective comes from Wirth’s work in the 1970s and 1980s, during which he designed influential programming languages such as Pascal and Modula. His focus was on clarity, simplicity, and logical progression in programming education and practice. Wirth believed that programming methodologies should evolve in a structured way, with small-scale programming forming the base for more advanced paradigms like OOP.

In essence, the quote conveys that OOP is a tool for handling complex software development, but its effective use depends on a strong foundation in procedural programming. Wirth frames OOP not as a replacement but as an advanced extension of programming principles, emphasizing the continuity and logical growth of programming knowledge.