AI & SOCIETY (2003) 17:322–339

The following three points should read as follows:

1. Page 322: Jan Borchers, Department of Computer Science, RWTH, Aachen, Germany

2. Page 335: Figure 11. should read as: abcd efg - b and c should be swapped with each other - e and f should be swapped with each other

3. Page 337: Figure 12. should read as: ab cd - a needs to be moved to position c - b needs to be moved to position a - c needs to be moved to position b