Complex Product Reliability

Abstract

Enrico and Fred discuss the difference between complex and complicated products and what it means for reliability engineering. Using examples ranging from rockets and home appliances to computers and fountain pens, they explore the limits of component-level analysis, the role of system testing, and why surprises remain unavoidable even in well-engineered products.

Key Points

Join Fred and Enrico as they discuss how reliability engineers should approach complex and complicated products.

Topics include:

Complex vs. Complicated: A complicated product has many components and interfaces, while a complex product is one where interactions and uncertainties can still create unexpected outcomes despite careful engineering.

The Inevitability of Surprises: Even with strong engineering practices and extensive analysis, new failure mechanisms, supplier changes, interface issues, and unexpected interactions can emerge when systems are brought together.

Balancing Analysis and System Testing: Component-level understanding is essential, but system-level testing remains necessary to uncover risks and interactions that cannot be fully predicted during design.

Good Reliability Starts with Good Engineering: Design guidelines, understanding damage mechanisms, derating practices, and disciplined engineering fundamentals remain the foundation for achieving reliable products.

Avoiding the “Test Everything” Trap: System testing should complement—not replace—engineering analysis. Organizations that rely solely on end-of-development testing risk missing opportunities to understand and prevent failures earlier in the design process.