This is No. 90 of our supplement issue. This attachment has been published with the periodical titled Hungarian Architecture for one and a half decades now as a supplement devoted to architectural theory, and is the one and only periodical continuously published in Hungary which focusses exclusively on theory. At the turn of the millennia we set ourselves the goal to edit a periodical of scientific standards when we launched Postscriptum also suited to provide an appropriate framework for Hungarian theoretical discourses. Articles and essays on architectural theory are also organised on the website of Postscriptum besides its printed publication. Since the year 2001, this project has been available for those wishing to track it on our website utoirat.meonline.hu, where the themes and all the articles of the individual issues can be searched based on general key words as well as tags (labels), much in the same way as in a classic catalogue.