The principles that support user-centred design are:

User-centred design is a development method that helps to ensure a service will be easy to use.

The principles that support user-centred design are:

1. The design is based upon an explicit understanding of users, tasks and environments.
2. Users are involved throughout design and development.
3. The design is driven and refined by user-centred evaluation.
4. The process is iterative.
5. The design addresses the whole user experience.
6. The design team includes multidisciplinary skills and
   
   perspectives.

Source: www.userfocus.co.uk.