Human centred design process
The human centred design (HCD) process goes from identifying and validating the needs of a user through to developing a solution to meets those needs.
The first two stages - Engage and Discover - are used to define the users and requirements.
Concept and Design are all about getting you to better define your solution.
Production gets you to refine designs and develop prototypes.
In these stages, you carry out your final testing before deploying your solution.