Tim Bell (University of Canterbury, New Zealand)
CS Unplugged in constrained environments

CS Unplugged offers ways to engage students with computer science away from computers. It was originally written for use in a conventional classroom situation, but in recent years it has been applied in a variety of contexts. Many of these contexts provide severe constraints, and we will look at a range of these. This will include contexts where computers aren’t allowed to be used, examples where the resources available are severely constrained, and at the opposite end of the spectrum, the case where the only access to education is through digital devices.

Bio: Tim Bell is a professor in the Department of Computer Science and Software Engineering at the University of Canterbury, New Zealand. His “Computer Science Unplugged” project is being widely used internationally. Tim has received many awards for his work in computing education including the 2018 ACM SIGCSE Outstanding Contribution to Computer Science Education award. Since 2008 he has been actively involved in the design and deployment of the approach to the teaching of digital technologies in New Zealand schools. He also plays instruments that have black and white keys.

Felienne Hermans (Leiden University and Free University Amsterdam)
Hedy: Creating a gradual programming language

Hedy is a gradual programming language to make learning programming easier. The core idea of Hedy is that it uses different language levels. In level 1, there is hardly any syntax at all, for example printing is done with:

print hello F# eXchange

In every level, new syntax and concepts are added, until kids are doing a subset of Python in level 22 with conditions, loops, variables and lists. The leveled approach means that learners do not have to learn all syntax rules at once. Hedy is aimed at children that want to get started with textual programming languages, but for whom starting with Python might still be too complex.

Hedy is open source, runs in the browser, is free to use, and available in fifteen different languages (Including English, Spanish, Chinese and Hindi). Hedy was launched in early 2020 and since then almost 1.5 million Hedy programs have been created by children worldwide. Try Hedy at www.hedycode.com. In this talk, Felienne will dive into the pedagogy behind Hedy, but also expand on the technical aspects of Hedy. For example, a set of increasingly complex grammars, rather than one grammar, poses new challenges for language design.

Bio: Felienne is an associate professor at the Leiden Institute of Advanced Computer Science at Leiden University, where she heads the PERL research group, focused on programming education. She also works at the Vrije Universiteit Amsterdam one day a week, where she teaches prospective computer science teachers. Felienne is the creator of the Hedy programming language and was one of the founders of the Joy of Coding conference. Since 2016, she has been a host at SE radio, one of the most popular software engineering podcasts on the web. Felienne is the author of “The Programmer’s Brain” a book that helps programmers understand how their brains work and how to use them more effectively. In 2021, Felienne was awarded the Dutch Prize for ICT research. Felienne is a member of the board of I&I, the Dutch association of high-school computer science teachers, and of TC39, the committee that designs JavaScript.


Hanno van Keulen (Windesheim University of Applied Sciences)