A Showstopper is a critical, unforeseen issue or flaw that halts everything. These high-priority defects, such as system crashes or broken core functionality, typically prevent the product from being released, tested, or operated until they are resolved. Showstoppers often result in significant delays and increased cost. In design, a showstopper is sometimes used to describe the opposite: a highly impressive "wow" feature.
Murphy's law is an epigram that is typically stated as: "Anything that can go wrong will go wrong." In UX and product design, Murphy's Law captures the grim inevitability that if there's a way for something to fail - no matter how unlikely - it eventually will. A feature will break at the worst possible moment. A user will try the one interaction no one tested. A stakeholder's favorite edge case turns out to be a real-world requirement. Murphy's Law isn't pessimism - it's about preparation.
The Swiss Cheese Model helps explain why accidents happen, often despite all our best intentions. It occurs when multiple small flaws line up perfectly to create a large failure. What appears to be a sudden disaster is usually the result of many small imperfections quietly lining up.
A canary release is a deployment strategy where you roll out a new feature or version to a small subset of users first, like sending a canary into a coal mine, before releasing it to everyone. It’s a way to catch problems early and minimize risk while gathering real-world feedback.
UX Theater is when a team goes through the motions of doing user experience work, but without improving the experience. It’s the performance of design thinking: sticky notes, empathy maps, and user personas that look great in a presentation, but have little to no impact on the final product. It’s like hosting a cooking show and never actually serving a meal.
“Design by committee” happens when too many voices get equal weight in the design process, and instead of a clear vision, you end up with a safe, bland compromise that pleases no one. It’s the UX equivalent of a potluck where everyone brings bread, technically edible, but deeply unsatisfying.
The false consensus effect is the tendency to assume that others share your opinions, beliefs, and preferences more than they do. In UX research, it shows up when small groups, whether participants, stakeholders, or even the design team, mistake their limited perspective for “what users want.”
A sad path is the scenario where something goes wrong in a user’s journey, whether it’s an error, invalid input, unexpected behavior, or a dead end. In UX, designing for the sad path means accounting for mistakes, edge cases, and failures gracefully, so users can recover without frustration.
The happy path refers to the ideal, friction-free journey a user takes through your product when everything works perfectly, no errors, no edge cases, no unexpected detours. It’s the “best case scenario” that your design or flow is intended to support.
Dogfooding is the practice of a company using its own product in real-world conditions, just like its customers would. It’s a way for teams to experience the product firsthand, uncover issues early, and demonstrate confidence in what they’re building.