The unpiloted Proton rocket's cargo will be an automated spacecraft known by the Russian acronym FGB (Zarya). Resource Node 1, which is being manufactured in the U.S. will be the second element launched. The node will provide storage space, berthing ports, and attachment points for other modules and the station's large truss. The Russian Service Module will be the third module launched, providing living and working space for three crew members. The first truss segment, designated as Z1 will also be attached during Phase 2.

At the end of phase-2 ISS will look almost like this,
due to delays some of the modules shown will be launched
in Phase III

When complete, ISS will comprise 43,000 cubic feet of living and working space, in addition to outside surface area available for research. Take a look at this ISS/Mir comparison image. Phase 3 includes 29 Shuttle flights.

Four solar arrays are added to Russian power/control mast providing additional Russian power. The Japanese Experiment Module (JEM) is delivered and activated and the U.S. Centrifuge Module is attached to Node 2 zenith port enhancing the user capabilities.

The fourth U.S. truss-based photovoltaic module is delivered, completing the major power system elements. The last flight of Phase 3 completes outfitting of the U.S. Habitation module.

At the end of phase-3 ISS will look like this