In terms of extending this legibility further, other elements of strategic design practice as conducted by Sitra’s SDU are outlined and discussed on the Helsinki Design Lab (HDL) website at helsinkidesignlab.org. In addition, SDU has published a book, In Studio: Recipes for Systemic Change (2011), which focuses in particular on the HDL Studio model, which is designed to rapidly prototype vision in complex, interdependent problem areas by better understanding the architecture of the problem