I cannot understand some of the concepts myself, an answer would be appreciated. What elements of a user interface design can be evaluated without building a working computer prototype ? What are the...

I cannot understand some of the concepts myself, an answer would be appreciated.

1. 
   What elements of a user interface design can be evaluated without building a working computer prototype?


2. 
   What are the major attributes should be used to assess the quality of a WebApp?
   
   


3. 
   Describe practices that enable designers to think about using patterns