How to use it
 

The two diamonds represent a process of exploring an issue more widely or deeply (divergent thinking) and then taking focused action (convergent thinking). 

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Discover 
The first diamond helps people understand, rather than simply assume, what the problem is. It involves speaking to and spending time with people who are affected by the issues.

Define
The insight gathered from the discovery phase can help you to define the challenge in a different way.

Develop
The second diamond encourages people to give different answers to the clearly defined problem, seeking inspiration from elsewhere and co-designing with a range of different people.  

Deliver
Delivery involves testing out different solutions at small scale, rejecting those that will not work and improving the ones that will.