To do a difficult thing in the simplest way, we need a lot of options. When looking an any set of tools for a task, such as a digital photo editing program, a novice will see complexity. A professional sees a range of different tools, each of which is easy to use. They know h...

A conceptual model is the underlying belief structure about how something works.

For example, on many computers, the process of dragging and dropping files into a folder seems simple because people already understand physical files and folders. But understanding it is...

The more complex something is, the more controls it needs, whether visible or invisible to the user.

• From the user's view, products and services are automated. If you stay at an expensive hotel, your room is always as you want it. The staff handles the complexi...

• How simple something looks is not a reflection of how simple it is to use. If complexity is a constant, then there are trade-offs.
• Things don't always need to be very simple for users. When a product or service is too simple, users can feel robbed of control. We should recogn...