IRIS symposium is an Austrian conference for legal informatics, in which eGovernment is also included in the conference programme. The conference takes place yearly in Salzburg/Austria. In the 2023 Austrian consortium consisting of BRZ/BMF, which is also involved in DE4A, explained Austrian findings and experience regarding Once Only Principle in the Single Digital Gateway Regulation (project, processes, architecture, environment and influence factors).

DE4A was part of the presentation at IRIS symposium, as an influence factor for the SDG Once Only realisation in Austria. The presentation took place on 23. February 2023 in the session "eGovernment I"; around 20 persons were in the audience (offline and online).