Academic, scientific or professional interest: Theoretical Chemistry and Computational Modelling (TCCM) play a key role in the development of modern chemistry, biochemistry, organic chemistry, physics and materials science. This role has been widely recognised by the international scientific community, resulting in the granting in 1998 of the Nobel Prize in Chemistry to John A. Pople, precisely for turning Computational Chemistry into a tool of predictive nature and therefore practically indispensable in any field of Chemistry and Physics. There is currently a growing number of applications of Chemistry in which the cooperation of Theoretical Chemistry and Computational Modelling is inevitable if we want to achieve a rationalisation of the observed reality. One paradigmatic example is mass spectrometry. Something similar can be said about the field of catalysis, in which molecular modelling plays an ever greater role. Moreover, in the important pharmaceutical industry, molecular modelling is a critical step in the process of generating a new drug. The synthesis of several variants of a possible active agent is much more expensive than the study of its possible activity by theoretical exploration based on Theoretical Chemistry and Computational Modelling methods. The situation is similar in regard to the synthesis of new materials. The most spectacular advances in the generation of various nanotubes, for example, came after they were modelled by computational means. Astrochemistry is another area in which the participation of Theoretical Chemistry and Computational Modelling is absolutely essential. The conditions found in interstellar space and in the atmospheres of the planets can be reproduced reliably by theoretical methods, while its reproducibility in the laboratory is much more difficult, if not impossible.