Towards the end of the Framework comparison presentation it is pointed out that Cairngorm is the framework that all Flex developers need to know. Well it would be nice if there were a few more developers in Melbourne who know Flex. Let alone developers with an understanding of Flex Frameworks. So the question I asked myself is if I had to train someone new next week who was unfamiliar with any Flex Frameworks which Framework would I want to teach them. The following table lists the concepts you need to understand for Cairngorm development compared to PureMVC. What is immediately evident is that there is a lot more to learn to get up to speed with PureMVC. To achieve a cleaner/purer framework PureMVC has added more complexity and this is a problem when you need to train people to use a Framework. When we started using Cairngorm it didn't take long to explain the basics of the Framework. But I think it would take a lot more explanation to get started on PureMVC despite the similarities in the two frameworks.