The Praterstadion, designed as a multifunctional sports venue with a running track, has been extended several times in the past and the spectator capacity has been continuously increased. No other austrian stadium has the capacity of hosting events with such a high number of visitors. This multifunctionality, especially the running track, today is perceived as a separation between spectators and the playing field, especially in football matches. In addition, the Ernst Happel Stadium no longer meets international standards, therefore it is of little relevance for major events. In the austrian population voices for change / renewal of the stadium, are continuously rising. However, the Happel Stadium is usually only used by the Austrian national team. Currently there is no high utilization by football only - a very controversial starting point. For a higher utilization and usability, the "National Stadium Vienna", like its predecessor, is planned as a multifunctional sports venue. Due to the variable arrangement of the spectator-stands, however, the view of the visitors of football matches is no longer disadvantaged. Variable spectator-stands in the lower ranks enable close proximity to the playing field in football matches, as well as large areas for athletics and music events. Furthermore, a retractable roof in a light membrane construction significantly increases usability and comfort. The walkable facade is conceived as a extension of the the urban space. Regardless of the season, it takes the visitor up, over the shell of the building, to a café, with a unique view over the green Prater and the surrounding area.