User Centred Design:
This is the process of designing a product where the intended users are involved throughout the design life cycle

There are many models for a system life cycle.

Requirements and functions analysis -> Preliminary design -> Specification design-> Testing & Evaluation -> Production -> Maintenance

UCD focuses on                                                            Usabiliity Goals : Effective to use , Efficent to use , Safe                      
                                                                                                                                                                                                                to use Have good utility Easy to leave Have good utility easy to learn

Usability goals
User charactristics Envoirment Tasks Workflow .......