The process of designing a sign solution is very similar to broader design process.  The primary difference can be summarized by the need to slow down and finesse select details and aspects of the process.  Pinpoint location of signs and their exact orientation demand focus and attention.  The task of writing and narrowing down to the absolute essence of messaging is important.  By the nature of signs, most readers of signs are in motion with limited time. The clarity of communication and attention to details cannot be overstated.