"good design comes from experience, experience comes from bad design." 
  Fred Brooks

Software design is a process whereby the coder uses certain techniques and principles to
establish a working blueprint that describes and details a solution for a well-defined
problem. The construction of of this so called model is required for development of
well-engineered software. Design, in turn should be divided into maybe a preliminary
design (ie module design and their interaction with one another) and a more detailed
internal module design. All in all, it seems as if excellent software design (and in turn,
well-engineered software) is written with the following end goals in mind: ease of use,
portability, ease of re-use, efficiency, and time to market.