Welcome at my personal space on the WWW. Topics:

• Education and Learning
  • Computer Science
    • The Characteristics of Pedagogical Content Knowledge of Teachers Teaching an Introductory Programming Course.
    • Lesmateriaal Informatica voor havo/vwo (Dutch).
  • Exploring Instantaneous Speed in Grade Five.
• History
  • The History of the ALGOL Effort.
  • Early Dutch computers and computer pioneers.
• Free Software
  • FlaskFiller, educational software to explore instantaneous speed in primary school.
  • Paja, Pandoc wrapped around in JavaScript.
  • Pandocomatic, Automating the use of pandoc.
  • Paru, Pandoc wrapped around in Ruby.
  • symbol2unicode: convert ASCII symbols to unicode.
  • SVG-cards-to-png to automatically generate PNG files of nice playing cards.
  • virtual_botanical_laboratory: generate plant-like structures using L-systems.

I have also published a number of research articles on some of these topics.

Feel free to send me an email message.