| Subject | English | Spanish |
| scient. | dynamical systems theory | teoria de sistemas dinámicos |
| IT | general systems theory | teoría general de los sistemas |
| ed. | systems science and theory | ciencias y teorìa de los sistemas |
| environ. | systems theory | teoría de sistemas |
| 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 | teoría de sistemas |