In experiments aiming to achieve thermonuclear fusion in a magnetically controlled plasma the interaction of the boundary plasma with the vessel walls plays a vital role. The high power load to the wall through energetic particles leads to erosion, limiting the lifetime of the wall components, contaminating the plasma core and building up high radioactive tritium inventories in redeposited layers. The solution of this problem is a highly interdisciplinary task involving plasma physics, surface physics, material engineering and technology. While in sattelite specialised meetings individual problems are discussed in detail, the PSI 2000 brings scientists from all these fields of science together. Only from these large meetings, promoting the interaction of scientists from the different fields, an important step in the integral solution of this complex problem can be expected.