| Subject | English | German |
| scient. | dynamical systems theory | Theorie dynamischer Systeme |
| ed. | ecological systems theory | ökologische Systemtheorie |
| tech. | general system theory | allgemeine Systemtheorie |
| IT | general systems theory | allgemeine Systemtheorie |
| automat. | linear system theory | lineare Systemtheorie |
| AI. | linear-systems theory | Theorie der linearen Systeme |
| AI. | nonlinear systems theory | Theorie nichtlinearer Systeme |
| gen. | signal and system theory | Signal- und Systemtheorie |
| tech. | system theory | nachrichtentechnische Systemtheorie |
| meas.inst. | system theory | Systemtheörie |
| gen. | system theory | Systemtheorie |
| environ. | systems theory The science concerned with the general study of structures and behaviours of systems which may be applicable in different branches of learning | Systemtheorie |
| ed. | systems theory | Systemlehre |
| gen. | systems theory | Systemtheorie |