Systems Design
Systems design is the engineering process undertaken in order to create a functioning system relevant to our intended purposes, once definition of certain aspects, inputs and outputs have been made clear, through the analysis of architectural frameworks, modules, interfaces and platforms, and the data itself needed for both the design of the system and the functioning of the system. The end user finds requirements and qualifications in his environment, and using this system is meant to live up to or satisfy these requirements.
It is a very intricate and complicated field that is so broad and encompassing, yet the amount of research and available methods, models and techniques on it in regards to the whole picture is minuscule as opposed to the specific and subjective parts of this field.