Rubin presents a list of five reasons (pp. 4-8). Here is a brief summary of his reasons.
These principles help designers and developers overcome the obstacles for creating usable products and systems.
Lewis and Reiman present a UCD process. How does this process incorporate the three UCD principles? How is their process similar to the process presented in HCI 210? Where does evaluation happen?
Many lists exist. Here is Rubin's list.
There are many different ways to describe and categorize evaluation methods. Here is one set of categories that Nielsen and Mack describe. They use it to motivate usability inspection methods.
In class, we will discuss user research for this simple unit conversion application.