Academic cooperation between three research and didactic centres of Lithuania, Germany and Poland (focusing on development of construction engineering and management) is presented. Formal meetings have been called Colloquia, and were organized alternately every two years in various academic centres. The last, 12^th Colloquium, took place in Vilnius. This cooperation was highly praised not only by University Senates, but also by groups of prominent politicians. The collaboration continues without a hint of prejudice or xenophobia, and results in a variety of joint publications, including books and monographs; and even academic promotions of PhD and Habilitation theses. Issues of applications of mathematical methods were initially dominant, but the prime focus is on development of planning tools. At present, the range of subjects is considerably broader. Apart from development and applications of operational research and multiple criteria methods, such issues as sustainability have also appeared. Since Professor E. K Zavadskas was the godfather of the Colloquia the article highlights the importance of VGTU.

Article in Lithuanian