Systems science is a science whose domain of inquiry consists of those properties of systems and associated problems that emanate from the general notion of systemhood.

Klir (2001) Facets of Systems Science. Kluwer: New York. p. 5; As cited by: Hieronymi, A. (2013), Understanding Systems Science: A Visual and Integrative Approach. Syst. Res. doi: 10.1002/sres.2215.