There is an interruption in the second paragraph of item 2 (Background). The Figure 1 is only mentioned in item 6 (future work) but does not appear to be the correct one.  

According to the title and the abstract, I would expect an evaluation of Sketchup as a 3D design toll and a critical view on the impacts of new 3D tools and technologies in architectural concepts and design. Unfortunately, the paper does not reflect the title or develop the abstract. 
