I learned the UCD process 15 years ago and I have been practicing its implementation since then.

Each steps of this process is of high interest to me. I have been learning how it can lead to designing successfull software and application.

"User-Centered Design (UCD) is a user interface design process that focuses on usability goals, user characteristics, environment, tasks, and workflow in the design of an interface. UCD follows a series of well-defined methods and techniques for analysis, design, and evaluation of mainstream hardware, software, and web interfaces. The UCD process is an iterative process, where design and evaluation steps are built in from the first stage of projects, through implementation." (Shawn Lawton Henry and Mary Martinson, Accessibility in User-Centered Design)

* The users are in the center of a double circle.
* The inner ring contains: Context; Objectives; Environment and Goals.
* The outer ring contains: Task Detail; Task Content; Task Organization and Task Flow.