The circular form has been chosen to represent the non-linearity of the UCD method.
The external ring represents the mindsets, the second one the moments where the Agile method is involved the most. The two internal rings visualize the different components for the two disciplines (User-Centered Design and Information Architecture) displayed in relation with the effort required for each one. Furthermore, every component involves different actors, which are placed on the the top as icons. In the inner part displays the deliverables which connect the different components.