Title : 
A unified approach to systems and software requirements
         
        
        
            Author_Institution : 
Praxis Critical Systems Ltd.
         
        
        
        
        
        
            Keywords : 
Geography; Hardware; Humans; Programming; Rail transportation; Railway engineering; Safety; Software engineering; Software systems; Systems engineering and theory;
         
        
        
        
            Conference_Titel : 
Requirements Engineering, 2001. Proceedings. Fifth IEEE International Symposium on
         
        
            Print_ISBN : 
0-7695-1125-2
         
        
        
            DOI : 
10.1109/ISRE.2001.948571