Next year the once devastated inner-city of Berlin sees the most exciting and historic event in present-day city planning. It has taken eight years to create the mammoth International Building Exhibition, with a cast list of contributors that reads like a Who's Who of contemporary architecture. Its focus is on social housing within the modern inner city. But the new ideas it proposes will not be hung on walls or exhibited as scale models. The venue for the exhibition is the city itself, real houses and building complexes, already inhabited, and designed to demonstrate how the city can once again become a place fit for people. This programme features the work of OSWALD MATHIAS UNGERS. HANS HOLLEIN , ROB KRIER and ALDO ROSSI. Their ideas could well become prototypes for the rest of the world, and their experiments prove that, instead of overall planning, individual solutions to building for the people can be hammered out with the people themselves. Narrator ANDREW SACHS