ISOS stands for "Integrated Strategy for Public Space Switzerland" and is a national program that aims to promote cooperation between various public actors in the field of spatial planning and design. All in all, it forms the federal inventory of sites in Switzerland that are worthy of protection and are of national importance.

ISOS is part of the Swiss spatial planning strategy and was introduced in 2014 by the Swiss Federal Council without a referendum. The program aims to promote a better understanding of public space, better cooperation between stakeholders and better planning of settlement structures and transport infrastructure.

It supports the actors in the implementation of projects that contribute to the achievement of the national goals of spatial planning and design. Furthermore, ISOS also supports the processes of participation and coordination in the spatial planning process.

The introduction of ISOS supports the concept of "integrated spatial planning", in which the various actors in public space pursue a common vision and strategy.

ISOS is repeatedly criticized because the program was introduced without a referendum and repeatedly stands in the way of the urgently needed densification, since entire street, neighborhood or village images are suddenly placed under protection.