It is relatively easy to design for the perfect cases, when everything goes right, or when all the information required is available in proper format.

In this quote, Donald Norman, a renowned cognitive scientist and usability expert, highlights the difference between designing for ideal conditions versus real-world scenarios. He points out that designing for perfect cases, where everything goes according to plan and all required information is readily available and properly formatted, is relatively straightforward. In these situations, the design can be clean, simple, and efficient because there are no unexpected challenges or constraints to account for.

Norman's statement underscores a key principle in design and usability—that real-world design is far more complex than simply addressing ideal or theoretical situations. In practice, designers often face imperfect data, unexpected user behavior, and various technical or environmental limitations. Effective design must anticipate these challenges and provide solutions that are flexible, adaptable, and user-friendly, even when conditions deviate from the ideal.

The origin of this quote is rooted in Norman’s work in human-centered design and his emphasis on the importance of designing for actual human experiences, rather than theoretical or perfect situations. His work, especially in books like The Design of Everyday Things, explores how products and systems should be designed to accommodate the variability of real-world use, focusing on making things easier and more intuitive for users.

Ultimately, Norman’s words remind us that designing with real-world complexity in mind is key to creating successful, functional products. The challenge for designers is to go beyond the theoretical and ensure that their creations can handle the unexpected, guiding users through various circumstances and providing the best possible experience, even when everything is not in perfect alignment.