| Subject | English | French |
| scient. | dynamical systems theory | théorie des systèmes dynamiques |
| IT | general systems theory | théorie générale des systèmes |
| gen. | in theory you're right, but in actual fact the system is unworkable | en théorie, tu as raison, en fait le système est inapplicable |
| automat. | linear system theory | théorie des systèmes linéaire |
| automat. | system theory | théorie des systèmes |
| 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 | théorie des systèmes |
| environ. | systems theory | théorie des systèmes |
| environ. | systems theory | théorie de systèmes |
| automat. | theory of relay systems | théorie des dispositifs de commutation |