Erratum to: Philos. Technol.

DOI 10.1007/s13347-011-0054-3

The original version of this article was inadvertently published with an incorrect title, author group and layout. The corrected version was published in Philos. Technol. (2012) 25:605–631 (DOI 10.1007/s13347-011-0058-z).