User-Centered Design (UCD)

The design is based upon an explicit understanding of users, tasks and environments. Users are involved throughout design and development. The design is driven and refined by user-centered evaluation. The process is iterative.

User-Centered Design
Wikipedia
Introduction to User-Centered Design
Usability First
User centred design
UserFocus
Government Digital Service Design Principles
GOV.UK
Notes on User Centered Design Process (UCD)
W3C
Looking Beyond User-Centered Design
A List Apart