1. Wim H.J. van Bon is a senior lecturer of special education at the University of Nijmegen, the Netherlands. His research focuses on language factors in reading and spelling problems. His coauthors graduated in 1989 from the Department of Special Education at the University of Nijmegen. Address: Wim H. J. van Bon, Instituut voor Orthopedagiek, Universiteit van Nijmegen, Postbus 9103, 6500 HD Nijmegen, The Netherlands.
2. Lidwien M. Boksebeld currently is a research associate in the same department and a school psychologist for the Oss School District.
3. Tonneke A.M. Font Freide works as an educational psychologist in a private institution for the treatment of learning problems.
4. Ardine J.M. van den Hurk participates in a research project on social skills training with multiply handicapped deaf children and is associated with the Orthopedagogenmaatschap Nijmegen for the treatment of learning difficulties.