Applying this approach, systems belonging to different scientific disciplines are investigated in their natural forms. On the basis of experimental results, isomorphic relations between different systems are studied and, finally, some general principles applicable for all systems of a certain class are formulated.

p. 97 as cited in: B. Van Rootselaar (2009) Annals of Systems Research. p. 114: About the aim of general systems theory - An approach to general systems theory (1969)