Universal Principles of Design, Revised and Updated: 125 Ways to Enhance Usability, Influence Perception, Increase Appeal, Make Better Design Decisions, and Teach through Design

Use confirmations to minimize errors in the performance of critical or irreversible operations.

Two-dimensional layering is useful for presentation and navigation.

A tendency to assume that a system that works at one scale will also work at a smaller or larger scale.1

Hawthorne Effect—Employees are more productive based on their belief that changes made to the environment will increase productivity. Pygmalion Effect—Students perform better or worse based on the expectations of their teacher. Placebo Effect—Patients experience treatment effects based on their belief that a treatment will work. Rosenthal Effect—Te

A key lesson of feedback loops is that things are connected—changing one variable in a system will affect other variables in that system and other systems. This is important because it means that designers must not only consider particular elements of a design, but also their relation to the design as a whole and the greater environment.

This impression is largely formed at the entry point to a system or environment.

Financial status is biologically important because it ensures a woman of security and status for herself and her children. However,

Fractals demonstrate self-similarity on virtually every level of scale. This image of the Valley of Seahorses region of the Mandelbrot Set demonstrates the extraordinary complexity and beauty of self-similar forms.

process of repeating a set of operations until a specific result is achieved.